Which of the following is the BEST design option to optimize security?

An organization requires a legacy system to incorporate reference data into a new system. The organization anticipates the legacy system will remain in operation for the next 18 to 24 months. Additionally, the legacy system has multiple critical vulnerabilities with no patches available to resolve them.

Which of the following is the BEST design option to optimize security?
A . Limit access to the system using a jump box.
B. Place the new system and legacy system on separate VLANs
C. Deploy the legacy application on an air-gapped system.
D. Implement MFA to access the legacy system.

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Answer: C