Which of the following is the best way to reduce the direct risks associated with using an unsupported version of the software?

Information systems auditors have found that software systems that are still in use are outdated for years and are no longer supported. The auditee stated that it still takes six months for the software to run on the current version.

Which of the following is the best way to reduce the direct risks associated with using an unsupported version of the software?
A . Monitor network traffic attempting to access an outdated software system.
B . Separating outdated software systems from the main network
C . Close all unused ports on the outdated software system
D . Verify that all patches have been applied to the outdated version of the software system.

Answer: A