Modify and run the program shown below in the following way. There is an array of 20 elements defined in the program. The elements of the array are: [20 18 16 14 12 10 8 6 4 2-10-20-30-40 15 23 25 75 45 33]. Thread l adds the first five elements (i.e., 20, 18, 16, 14, 12), Thread 2 adds the next five elements (i.e., 10, 8, 6, 4, 2), , Thread 4 adds the last five elements (23, 25, 75, 45, 33). Finally, the sum of all the 20 elements is printed by the program. include # include # include # define NUM THREADS 3 integral counter = 1; void *print Hello (void *thread) {counter = 2* counter + (int) thread; print f (" Thread Id: %d Counter: %d ", thread, counter); pthread_exit (NULL);} int main (int argc, char *arvg[]) {pthread_t threads [NUM_THREADS]; int rc, t; for (t = 0; t