int c 7 // global variable int main() { pid_t pid } == fork(); c++; if (pid == -1) exit (-1); else if (pid == 0) else c += 2; printf("I am the child, c is %d ", c); c += 4; printf("I am the parent, c is %d ", c); a. What is the output? b. Is any other output possible? Defend your answer.