The best protection against physical threats, especially in a common area where the computer is publicly accessible, involves physically securing the hardware.
Option A: Using screen lock
Screen locks are good for securing access temporarily but do not protect against physical tampering or theft.
Option B: Installing a privacy screen
Privacy screens prevent visual access but do not secure the hardware.
Option C: Implementing password complexity
Password complexity helps secure digital access but does not prevent physical threats.
Option D: Locking the computer case
Physically securing the case prevents unauthorized individuals from tampering with internal components or stealing the computer.
Option E: Enabling drive encryption
Encryption protects data but does not prevent physical access to the hardware itself.
Reference:
CompTIA A+ 220-1102 Objective 2.1 (Physical security), particularly physical security measures like locking the computer case.