Applications That Clean Viruses from Systems Are Sometimes Called "Virus

Applications that clean viruses from systems are sometimes called "Virus Scrubbers". One drawback is that they are only as good as their last signature update, and even at that, many types of malware could be undetectable if there is no signature.
Another approach is to detect corrupt files, or at the very least, files that have been modified that shouldn't be. What type of tool performs this technique?

A) Rootkit Revealers
B) Firewalls and Virtual Private Networks
C) Anti-Phishing, Anti-Malware etc
D) File Integrity Verification tools