Consider the following JavaScript skeletal program:

// The main program

var x;

function sub1() {

var x;

function sub2() {

.

}

}

Function sub3() {

.

}

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

main calls sub1

sub1 calls sub1

sub2 calls sub3

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

Repeat part a, but assume dynamic scoping