SUCURI Security shows this message in malware scan. Please help.

Security Header: X-XSS-Protection Missing
We did not find the recommended security header for XSS Protection on your site.

http://kb.sucuri.net/warnings/hardening/headers-x-xss-protection

Security Header: X-Frame-Options
We did not find the recommended security header for ClickJacking Protection on your site.

http://kb.sucuri.net/warnings/hardening/headers-x-frame-clickjacking

Security Header: X-Content-Type nosniff
We did not find the recommended security header to prevent Content Type sniffing on your site.

http://kb.sucuri.net/warnings/hardening/headers-x-content-type

Server Banners Displayed
Your site is displaying your Apache web server default banners.

http://kb.sucuri.net/warnings/hardening/disable-server-banners