Which of the following is NOT a valid parameter passing mechanism in C#?

What is the keyword used to define a function in C#?

A. function

B. func

C. method

D. def

What is the purpose of a return type in a method declaration in C#?

A. To specify the access modifier of the method

B. To specify the type of data returned by the method

C. To specify the parameters of the method

D. None of the above

In C#, which keyword is used to define a method that does not return a value?

A. return

B. none

C. void

D. null

What is the correct syntax to declare a method named Add that takes two integer parameters and returns their sum in C#?

A. Add(int num1, int num2)

B. int Add(num1, num2)

C. Add(num1, num2)

D. int Add(int num1, int num2)