What is the output of the following program: #include using namespace std; int fun(int data); int main() { int data = 3; data = fun(data); cout < < "data is " < < data < < endl; return 0; } int fun(int data) { int x = 8, sum= = 0; while (--x) { sum += x; if (x %3 == 0) break; } return ++sum; Select one: a. data is 13. b. error c. data is 141 d. data is 21