Fill the stack with all activation record instances, including local variables, static and dynamic chains, when execution reaches position 1 in the following skeletal program. procedure Main is var A : integer; procedure Subl is var B: integer; procedure Sub2 is var C, D : integer; procedure Sub3 is var A : integer; begin ---- of Sub3 end; ---- of Sub3 procedure Sub4 is var B, C: integer; begin ---- of Sub4 Sub3; -------------- 1 end; ---- of Sub4 begin ---- of Sub2 Sub4; end; ---- of Sub2 ---- of Sub1 begin Sub2; end; ---- of Sub1 begin ---- of Main Subl; end; ---- of Main