Question: What action should an MME (Mobility Management Entity) take upon receiving a GPRS Kc' from a source MSC (Mobile Switching Center) server enhanced for SRVCC (Single Radio Voice Call Continuity) in a CS (Circuit Switched) to PS (Packet Switched) Handover request for a GSM subscriber?
Option 1: Reject the handover request
Option 2: Accept the handover request and authenticate the subscriber
Option 3: Request additional security credentials from the subscriber before processing
Option 4: Forward the request to another MME for further evaluation
Explanation: This is in line with the security objective of preventing GSM subscribers from accessing EPS (Evolved Packet System) services via SRVCC into E-UTRAN, as the subscriber's security context (indicated by GPRS Kc') is not compatible with the target network, thus the MME must reject the request to maintain network security and adhere to specified security architectures.