You are developing a customer web form that includes the following HTML.

<input id = -txtValue- />

A customer must enter a value in the text box prior to submitting the form.

You need to add validation to the text box control.

Which HTML should you use?

A.<input id=-txtValue- type=-text- required=-required-/>

B.<input id=-txtValue- type=-text- pattern=-[A-Za-z]{3}- />

C.<input id=-txtValue- type=-required- />

D.<input id=-txtValue- type=-required- autocomplete=-on- />

Explanation:

Definition and Usage

The required attribute is a boolean attribute.

Whenpresent, it specifies that an input field must be filled out before submitting the form.

Example

An HTML form with a required input field:

<form action=-demo_form.asp->

Username:

<input type=-text- name=-usrname- required />

<input type=-submit- />

</form>

Username:

<input type=-text- name=-usrname- required />

Reference: HTML

<input>

required Attribute

http://www.w3schools.com/tags/att_input_required.asp