Which code segment should you use?

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

<input id="txtValue" type="text" />

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

You need to add validation to the control.

Which code segment should you use?

A . Option A
B . Option B
C . Option C
D . Option D

Answer: D

Explanation:

.val

Return value

A string containing the value of the element, or an array of strings if the element can have multiple values