Your computer crashed, and you lost many personal and work-related files. You just got a new computer, but you are now much more concerned about viruses and other security threats. Which strategy can help you protect your computer against virus attacks? Answer choices

A Disable your Web browser's automatic security settings so you can manually control the content you download.

B Open email attachments only from unknown senders.

C Update the definitions on your anti-virus application frequently.

D Perform regular backups of your hard drive.

PLS HELP!
WILL MARK BRAINLIEST!
:)