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Option D offers the fastest and most flexible solution to urgently apply third-party patches across a large fleet of EC2 instances with minimal operational overhead.
Option A Incorrect – AWS Lambda is not suitable for managing and patching third-party software on EC2 instances at scale. Option B Incorrect – AWS Systems Manager Patch Manager is designed for OS patching, not third-party software patching Option C Incorrect – A maintenance window schedules updates but does not immediately apply the patch, delaying remediation Option D Correct – AWS Systems Manager Run Command allows immediate execution of a custom patching script across all EC2 instances, ensuring quick remediation.
I would vote for B as the option for Run command does not have exception handling capabilities like patch failures. OR the command has to be scripted to handle such cases, which is additional operational overhead - especially for cases where the exception corner cases are not handled in the script.