3. Assume the following JavaScript program was interpreted using static-scoping rules. What value of x is displayed in function sub1? [20 pts] var x; function sub1){ document.writer>h function sub20 0 var x; x=10; sub10; x = 5; sub2(); 4. Consider the following JavaScript program: var x, y, z; function sub10 var a, y, Z; function sub20 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. [30 pts]