A security engineer must resolve a vulnerability in a deprecated version of Python for a custom-developed flight simul-ation application that is monitored and controlled remotely. The source code is proprietary and built with Python functions running on the Ubuntu operating system. Version control is not enabled for the application in development or production. However, the application must remain online in the production environment using built-in features. Which of the following solutions best reduces theattack surface of these issues and meets the outlined requirements?
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