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