Errata

$inlinecount -> it's the calculated count after applying any $filter present in the URI (not the count of the returning entities)
As an example:
http://servicehost/ExamPrepService.svc/Questions?$inlinecount=allpages&$top=10&$filter=id gt 5
Identifies the first 10 Questions Entries whose IDs are greater than 5 and includes a count of the total number of Questions Entries that have an ID greater than 5.

$orderBy -> please, give a note that the default order is asc unless otherwise specified (asc desc),
$top -> In the behavior column, the URI will skip 10 and return the next 5 after that (not 10)

- SqlConnectionStringBuilder donnBuilder = new SqlConnectionStringBuilder();
-> donnBuilder should be renamed to be ConnBuilder

- efBuilder.Provider = Provider;
-> P of Provider must be small letter as in its definition.
String provider = "System.Data.SqlClient";

Suggestion: ConnBuilder should be connBuilder with small letter c

Depending on the answer, you must add (Choose all that apply.) at the end if the question.

IAsyncResult sqlResult sqlCommand.BeginExecuteReader(CommandBehavior.
CloseConnection);
=> missing =

using (SqlDataReader sqlReader = sqlCommand.EndExecuteReader(Result))
=> Result must be sqlResult

This question should be added to objective 2.3 no on 2.4.

Next, the properties inside the context are typed as DbSet types instead of
ObjectSet types.

DbSet and ObjectSet must replace each other.

(Choose all that apply) must be added to the question.

Should be added to "Objective 1.1" not the current one.

I think that is not related to the original question: "1. Would using the Entity providers help facilitate the transition?"
I think you should change the question or modify the answer.

Qu. 2 is missing, no such question. So it must be deleted and Qu. 3 to be renamed to be Qu. 2.

B and C should be replaced each other here or in the question options itself.

The 3rd word "DataContract" should be replaced with "IsReference"

I think bullets 2 and 3 should be moved to objective 3.2

You have never explained OneWay attribute till this point.

(Choose all that apply) must be added to the question.

The answers are not related to the question, please, change the answer or the question.

Answers of qu.2 and qu.3 are missing.

Answer of qu. 2 is actually the answer of qu. 3.
Qu. 2 answer doesn't exist.

Questions are numbered 3, 4 and 5 but it must be 1, 2, and 3.

It should be "Search all Customers by Last Name" instead of "Search all Customers on a specific AccountId by Last Name"

The signature of the 2nd method should be:
public IEnumerable<Customer> SearchCustomers(string lastName)

The two links contain an extra "Controller/" word.

The two links contain an "data" word instead of "api".

The url of the 1st call should be:
$.getJSON('api/Customer/GetCustomer?accountId=4')
- api instead of data
- GetCustomer instead of GetCustomers

In order to show results as in figure 4-4, the url of the 1st call should be:
$.getJSON('api/Customer/GetCustomer?lastName=')
- api instead of data
- "lastName=" instead of "accountId=4"

It should be _contentRepository = contentRepository;
Instead of
_contentRepository = new WebClientContentRepository();

C is not correct, also it is not "Accept-Encoding" in the question, it's "Accept-Request"
Modify the question options or the answer.