29. Consider the following skeletal C program Dur void funi (void); /* prototype void fun2 (void); /* prototype */ void fun3 (void); /* prototype */ void main() { int a, b, C; } void funl (void) int b, c, d; } void fun2 (void) int c, d, e; } void fun3 (void) { int d, e, fi his study shared via Coursel } Given the following calling sequences and assuming that dynamic scoping is used, what variables are visible during execution of the last function called? Include with each visible variable the name of the function in which it was defined (4 points) a) main calls fun3; fun3 calls fun2; fun2 calls funl