a. You are working on a project that contains the following code: int w, x, y, z; scanf(''%d %d", &x , &y); printf("x = %d, y = %d ", x, z = first-function(x, y); printf("z = %d ", z); w second-function(x, y, z); printf ("w-%d ", w); y); When you run the code, you get the following output: Segmentation Fault A classmate points out that the problem must be with first function since the program crashes before it can print anything else. Are they correct? Explain. [4 pts] b. The following code crashes with a segfault. Why? [3 pts] int *p = -12; printf("p = %d ", *p )