Which of the following is the BEST solution to improve the equipment's security posture?

Which of the following is the BEST solution to improve the equipment’s security posture?

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Legacy medical equipment, which contains sensitive data, cannot be patched.

Which of the following is the BEST solution to improve the equipment’s security posture?
A . Move the legacy systems behind a WAF
B . Implement an air gap for the legacy systems.
C . Implement a VPN between the legacy systems and the local network.
D . Place the legacy systems in the DMZ

Answer: C