The code shown below is compiled and executed, which part of the process will hold the int variable sum?

a. text

b. data

c. heap

d. stack

e. BSS

long sum = 0; void do_work(int); int main(int argc, char **argv) { struct tms t; int n = 100000; do_work(n); times (&t); printf("system time: %ju ticks ", (uintmax_t) t.tms_stime); return 0; } void do_work(int n) { long i; int fd; char buf[1024]; for (i = 1; i