Consider the following JavaScript Skeletal program (10 pts) // the main program var x; function sub1()[ var X function sub2()I function sub3 ()f 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 reference to x sub2 sub 3 b. Repeat part a but assume dynamic scoping sub1 ii)