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

<input id=-txtValue-/>

You need to develop the form so that customers can enter only a valid country code consisting of three English alphabet characters.

Which code segment should you use?

A. Option A

B. Option B

C. Option C

D. Option D

Explanation:

* The val() method returns or sets the value attribute of the selectedelements.

* HTML<input>pattern Attribute

The pattern attribute specifies a regular expression that the <input> elements value is checked against.

Example

An HTML form with an input field that can contain only three letters (no numbers or special characters):

<form action=-demo_form.asp->

Country code:

<input type=”text” name=:country_code”

pattern=”[A-Za-z]{3}” title=”Three letter country code”>

<input type=”submit”>

</form>

Reference: HTML <input> pattern Attribute

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