Consider the following program: In each case YOU MUST SHOW ALL OF YOUR WORK proc main int X, Z; proc A: int a; proc B; int x, a; { x:= 2; a:= 8; call C; print x; } (end B) proc C; int z; {x = 4; z = 7; print a; } (end C) { x:= 3; z = 5; a:= 6; call B; print x;) (end A) proc D; int x, b; proc E; int x, Z; { x:= 5; z:= 11; call F; print x; } (end E) proc F; proc G; { print z; x:= 8; call A; print x; } (end G) { print x; call G; x:=7; } (end F) { x:= 12; call E; print x; } (end D) { x:= 1; z:= 9; call D; print x; } (end main) (a) (6pts) What is the program output assuming static scoping rules are employed? (b) (6pts) What is the corresponding output when dynamic scoping rules are employed? (c) (5pts) List all of the units (proc's) that proc C can call (assuming static scoping). (d) (4pts) Specify the referencing environment of proc F (assuming static scoping) That is, list the variables that are visible to proc F