True or False?

1.A variable created inside a function definition can be used outside the function as long as the function has been called first.

2.If you define a function in Python, it cannot call another function that you have written.

3.In Python, a function must be defined before it can be invoked.

4.What is the maximum number of return statements Python allows in a function definition? A:2 B:0 C:anynumber D:1