Answer the following statements true (T) or false (F)

1) A local variable of a function is not visible in any other function.
2) The following statement
```
double sum( double x, y );
```
is a valid function prototype.
3) Function prototypes should be placed after the call to function main.
4) Each time a function call is executed, the program allocates memory cells for both the function's formal parameters and local variables.
5) The names of a function's formal parameters must be the same as the names of the actual arguments in the function call.

1) T
2) F
3) F
4) T
5) F