No working needed, just the letter answer. All questions needed. Will give thumbs up for correct answers.

A. Determine whether the following is a valid beginning of a function definition vold PrintValues(double x, int y) Select one: a. Valid b. Invalid B. The following is an example of a function stub: int CountofAlpha(string input) ( int count = 0; int i = 0; for(i = 0; i input. length(); ++i) { if (isalpha(input.at(i)) ++count; return count; Select one: a. True b. False C. Which statement contains a common error or mistake with functions? double AreaOfCircle(double radius) const double pi = 3.14159265; double area 0.0; double temp = 0.0; temp = pow(radius, 2); area = pi * temp; return radius; Select one: a. const double pi 3.14159265; b. temp pow(radius, 2); c. return radius; d. No errors or mistakes