Show the stack with all activation record instances, including static and dynamic chains, when execution reaches position 1 in the following skeletal program. Assume bigsub is at level 1.

function bigsub() {

function a() {

function b() {

... <1

} // end of b

function c() {

...

b();

...

} // end of c

...

c();

} // end of a

...

a();

...

}// end of bigsum