Given the following calling sequences and assuming that dynamic scoping is used, what variables areGiven the following calling sequences and assuming that dynamic scoping is used, what variables are

visible during execution of the last function called? Include with each visible variable the name of the

function in which it was de ned.

a$.$ main calls fun$1$; fun$1$ calls fun$2$; fun$2$ calls fun$3.$

visible during execution of the last function called? Include with each visible variable the name of the

function in which it was de ned.

a$.$ main calls fun$1$; fun$1$ calls fun$2$; fun$2$ calls fun$3.$