Which of the following is the required code?

You work as a developer at ABC.com. The ABC.com network consists of a single domain named
ABC.com. You make use of CSS3 and HTML5 for development purposes.
You are in the process of creating a new client web form for ABC.com. You have added the HTML
input field shown below:
<input id=”txtValue” type=”text” />
You want to write the appropriate code to make sure that txtValue has a value inserted, prior to the

form being tendered.
Which of the following is the required code?

A.
function validate() {
var name = $(“#txtValue”).val () ;
if (name == null // name == “”)
alert (“please enter valid value”) ;
return;
}

B.
function validate() {
var name = $(“#txtValue”).val ($) ;
if (name == null // name == “”)
alert (“”) ;
}

C.
function validate() {
var name = (“#txtValue”).val ($) ;
alert (“please enter valid value”) ;
}

D.
function validate() {
var name = $().val () ;
if (name == $ // name == “$”)
return;
}

Explanation: