Consider the following JavaScript skeletal program:

Assume that the execution of this program is in the following unit order:

main calls sub1

sub1 calls sub2

sub2 calls sub3

a. Assuming static scoping, in the following, which declaration of x is the correct one for a reference to x?

i. sub1

ii. sub2

iii. sub3

b. Repeat part a, but assume dynamic scoping.

// The main program var x; function subl () { var x; function sub2 () } } function sub3 () {