What is something that must be done to ensure that your anti$-$malware and$/$or anti$-$virus system stays useful?

Group of answer choices

Users must never learn more than is strictly necessary to preserve anti$-$malware security

Users must learn the entire manual for any anti$-$malware system for it to be effective

Its signatures and definitions must be updated regularly to protect against new threats

Its signatures and definitions must be defended from viruses and only updated sporadically