To answer this question, you need to understand the different ways to retrieve data from a database.
Option A) Data Set - This option is incorrect because a Data Set is an in-memory representation of data that allows you to store and manipulate data from multiple tables. It is not specifically designed for retrieving a read-only, forward-only stream of data.
Option B) Typed Data Set - This option is incorrect because a Typed Data Set is a subclass of a Data Set that provides strongly-typed access to the data. Like a regular Data Set, it is not specifically designed for retrieving a read-only, forward-only stream of data.
Option C) DataReader - This option is correct because a DataReader is a lightweight, forward-only, read-only stream of data from a database. It provides efficient access to data by retrieving one row at a time, which is useful when you only need to read the data and do not need to modify it. The DataReader is commonly used when performance is a concern or when working with large result sets.
The correct answer is C) DataReader. This option is correct because it provides a read-only, forward-only stream of data from a database.