A. Antivirus: Protects against malware and viruses.
B. Encryption: Secures data by making it unreadable to unauthorized users.
C. Firewall: Monitors and controls incoming and outgoing network traffic based on security rules.
D. Firmware: While it can have security features, it is primarily the software that controls hardware. It does not directly prevent security breaches by itself.
Therefore, Option D is correct.
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