(3) An alternative way to achieve mutual exclusion is to use another atomic instruction Swap whose functionality is described by the following C code void Swap(int *a, int *b) int tmp *a; *a = *b ; Using the Swap instruction, mutual exclusion of the executions of xx1 can be achieved as follows. int key = (F)]. while G)1 Swap((H lock0; Here, x and lock are shared variables whose nial values are 0, and key is a local variable Answer appropriate expressions that fill the blanks from (F) to (