Which method of the EntityCommand type should you use?

You are developing an ASP.NET MVC application. The application has a page that searches for and displays
an image stored in a database. Members of the EntityClient namespace are used to access an ADO.NET Entity
Framework data model Images and associated metadata are stored in a database table.
You need to run a query that returns only the image while minimizing the amount of data that is transmitted.
Which method of the EntityCommand type should you use?

A.
ExecuteScalar

B.
ExecuteDbDataReader

C.
ExecuteReader

D.
ExecuteNonQuery

Explanation:
The SqlCommand.ExecuteScalar method executes the query, and returns the first column of the first row in the
result set returned by the query. Additional columns or rows are ignored.
https://msdn.microsoft.com/en-us/library/system.data.entityclient.entitycommand(v=vs.110).aspx