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

1. A function call is a valid statement
2. A user-defined function can call library functions or user-defined functions
3. An actual output argument must be of the same pointer data type as the corresponding formal parameter.
4. Insertion of stubs is a part of top-down testing
5. An expression cannot be used as an actual argument in a call to a function.

1. True
2. True
3. True
4. True
5. False