A. Convert the following BNF to EBNF:

begin end

| ;

=

A | B | C

+

| -

|

B. Consider the following JavaScript program: var x, y, z;

function sub1 () {

var a, y, z;

function sub 2 () {

var a, b, z;

. . .

----------- 1

}

. . .

----------- 2

}

function sub3 () {

var a, x, w;

. . .

----------- 3

}

List all the variables, along with the program units where they are declared, that are visible in the bodies of sub1, sub2, and sub3, (Points 1, 2, and 3) assuming static scoping is used.