Problem 2: [6 points] Consider the following JavaScript skeletal program: The main program var X; function subl var X; function sub2 ( i 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 ofX1S the correct one for a reference to x? b. Repeat part a, but assume dynamic scoping