Show the stack with all activation record instances, including static and dynamic chains, when execution reaches position 1 in the following skele- tal program. Assume Bigsub is at level 1 procedure Bigsub is MySum Float; procedure A is X : Integer; procedure B(Sum Float) is Y, 2 Float; begin of B C(Z) end; of B begin - of A end of A begin -of c end; of C procedure C(Plums : Float ) is L Float; begin of Bigsub end; -- of Bigsub