You are designing a user input form that is part of an ASP.NET Web Forms application. You

need to ensure that users cannot attack the Web server by submitting invalid data. Which
approach should you recommend?

A.
Install a certificate on the Web server, and force all Web traffic to use SSL.

B.
Write an onSubmit Java Script handler that validates all form input

C.
Write an onSubmit JavaScript handler that URL-encodes all data that is passed to the
server.

D.
Write an OnClick method for the Submit button that rejects form submissions that contain
invalid data