a) Which ) are global What does it mean that a variable is b. (2 points) Which variable(s) are reference called by reference vs. by value? variable(o)? What does t mean that a variabie a c. (6 points) What is printed by this program? Part 4 (6 points total)-Code a) (5 points) Write the definition of a function that takes as input three numbers. The function returns true if the first number to the power of the second number equals the third number, otherwise, it returns false. (Assume that the three numbers are of type double.) (1 point) Write the function prototype for this function