It has come to the IT administrator’s attention that the “post your comment” field on the company blog page has been exploited, resulting in cross-site scripting
attacks against customers reading the blog. Which of the following would be the MOST effective at preventing the “post your comment” field from being exploited?

A.
Update the blog page to HTTPS

B.
Filter metacharacters

C.
Install HIDS on the server

D.
Patch the web application

E.
Perform client side input validation