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 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.