Consider the following JavaScript program:

var x, y, z;

Function sub1() {

var a, y, z;

function sub2() {

var a, b, z

}

}

function sub3() {

var a, x, w;

}

List all the variables, along with the program units where they are declared, that are visible in the bodies of sub1, sub2, and sub3 assuming static scoping is used.