The first reply packet for Student failed the RPF check. This issue can be resolved by adding a static route to 203.0.114.24/32 through port3.
Option C is the correct answer based on the provided information, let's analyze it:
Option C states: "The first reply packet for Student failed the RPF check. This issue can be resolved by adding a static route to 203.0.114.24/32 through port3." The issue is related to the first reply packet from the Student failing the Reverse Path Forwarding (RPF) check and that adding a static route to 203.0.114.24/32 through "port3" will resolve the problem, then you can go ahead with this solution.
In a typical RPF check scenario, it ensures that the incoming packet is arriving on the expected interface based on the routing table. Adding a static route to 203.0.114.24/32 through "port3" may indeed resolve the RPF issue if the routing is misconfigured.
Option C is the correct solution based on your network setup and further analysis, you can proceed with implementing that static route to see if it resolves the issue. Additionally, it's a good practice to monitor the network to ensure that the problem is indeed resolved after making the change.