this is computer science 1428 course in C++

please give me detailed answer for me to study. thank you.

Identify the following items and write them in the appropriate spaces provided below. Use the choices provided below: a) Function call b) Return Statement c) Function Prototype d) Function Definition float add (float, float); int main() {float a, b, c; a = 2; b = 4; c = add (a, b); return 0;} float add (float g, .float h) {return g + h;}