Assume the following function definition and dynamic scoping rules:

function f$()\{$

function sub$2()\{$

var x $=7$;

sub$1()$;

$\}$

function sub$1()\{$

var y $=$ x;

$\}$

var x $=3$;

sub$2()$;

$\}$

What would be the value assigned to variable y in sub$1?$