What does the yield return statement specify in the following C# code snippet?

public System.Collections.IEnumerator GetEnumerator()
{
    foreach (char ch in chrs)
    yield return ch;
}

A. To define namespaces B. To declare variables C. To import external libraries D. To create instances of classes

A. Exits the switch statement B. Skips the current iteration C. Continues to the next iteration D. Throws an exception

A. public B. internal C. protected D. private

A. To declare a constant B. To prevent a variable from changing C. To allow a variable to be changed D. To declare a static variable