Which of the following is the function prototype, the function header, and the function call for the function void showNum(double num)?

a) Function prototype: void showNum(double); Function header: void showNum(double num) {} Function call: showNum(45.67);
b) Function prototype: void showNum(double num); Function header: void showNum(double num) {} Function call: showNum(45);
c) Function prototype: void showNum(double num); Function header: void showNum(double num) {} Function call: displayNum(45.67);
d) Function prototype: void showNum(double num); Function header: void showNum(double num) {} Function call: showNumber(45.67);