Which of the following hardening techniques should the technician perform on a regular schedule to ensure all switches have the same features and security functionality?

A network technician notices that switches of the same model have different commands and security features while administering them. Which of the following hardening techniques should the technician perform on a regular schedule to ensure all switches have the same features and security functionality?
A. Change the default credentials.
B. Verify the firmware file hash.
C. Disable unused switchports.
D. Apply patches and updates.

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