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.

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function bigsub () { var mysum; function a () { var x; function b (sum) { var y, z; c(z); .. } // end of b .. b (x); } // end of a function c (plums) { <- -1 .. } // end of c var 1; a (); ... } // end of bigsub