Which of the following would BEST protect against future adversary access to the BIOS, in case another rootkit is installed?

An administrator has been investigating the way in which an actor had been exfiltrating confidential data from a web server to a foreign host.
After a thorough forensic review, the administrator determined the server’s BIOS had been modified by rootkit installation. After removing the rootkit and flashing the BIOS to a known good state, which of the following would BEST protect against future adversary access to the BIOS, in case another rootkit is installed?
A. Anti-malware application
B. Host-based IDS
C. TPM data sealing
D. File integrity monitoring

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