1. Where does the execution of the program starts? a) user-defined function b) main function c) void function d) none of the mentioned 2. What are mandatory parts in function declaration? a) return type, function name b) return type, function name, parameters c) both a and b d) none of the mentioned 3. which of the following is optional when declaring a function? a) function name b) function parameters c) function return type d) All of the mentioned 4. What is the scope of the variable declared in the user defined function? a) whole program b) only inside the 0block of the function c) both a and b d) none of the mentioned 5. How many minimum number of functions are required to be presented in c++? a) 0 b) 1 c) 2 d) 3