What kind of exception is being thrown if Wait(), Pulse() or PulseAll() is called from code that is not within synchronized code?

What is the purpose of the "using" keyword in C#?

A. To define namespaces

B. To declare variables

C. To import external libraries

D. To create instances of classes

What does the "break" keyword do in a switch statement?

A. Exits the switch statement

B. Skips the current iteration

C. Continues to the next iteration

D. Throws an exception

Which of the following is NOT a valid C# access modifier?

A. public

B. internal

C. protected

D. private

What is the purpose of the "readonly" keyword in C#?

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