ConsiderthefollowingJavaScriptskeletalprogram:

$//$ The main program

var x;

function sub$1()\{$

var x;

function sub$2()\{$

$...\}$

$\}$

function sub$3()\{$

$...\}$

Assume that the execution of this program is in the following unit order:

main calls sub$1$ sub$1$ calls sub$2$ sub$2$ calls sub$3$

$1.$ Assuming static scoping, in the following, which declaration of x is the correct one for a reference to x$?$

$1.$ sub$12.$ sub$23.$ sub$3$

$2.$ Repeatparta,butassumedynamicscoping.