Need a little help in HTML Text Input Boxes. : Currently user is allowed to enter information to all the 5 input boxes. I am working on creating something where user to only be allowed to answer 3 questions from the form and as he answers the 3 questions of his choice the rest of the input text fields (boxes) in the form become disabled.

    <html>    
    <h1>Security Questions</h1>
    <body>
    <p>
    Only Enter Answer 3 Security Questions.
    </p>
    <form action="/submitAnswer.php" method="POST">
    
    <label>What City Was Your Mom Born In?</label><br>
    <input type="text" id="secQuestion01" name="secQuestion01"><br>
    
    <label>What Is Your Dream Car?</label><br>
    <input type="text" id="secQuestion02" name="secQuestion02"><br>
    
    <label>What Is Your Mother's Maidan Name?</label><br>
    <input type="text" name="secQuestion03"><br>
    
    <label>What's Your Dream Job?</label><br>
    <input type="text" name="secQuestion04"><br>
    
    <label>Name Your First Grade Teacher?</label><br>
    <input type="text" name="secQuestion05"><label><br>
    
    <label>Name Your First Pet?</label><br>
    <input type="text" name="secQuestion01"><label><br>
    </form>
    </body>
    </html>