Show how the swap instruction can be used to implement a lock for mutual exclusion. Complete the code below. do key - TRUE; -blank1- (-blank2- = -blank3-) { Swap (-blank4-, &-blank5-) } critical section / lock - false; /* remainder section / } while (true); blank1 blank2 [Choose ] &key lock while TRUE key if &lock blank3 blank4 [Choose ] blank5 [Choose ]