Question: In a UTRAN to GERAN Iu-mode relocation for CS (Circuit Switched) services, what information may be included by the RNC in the RELOCATION REQUIRED message if available?
Option 1: GERAN Classmark Information Element (IE)
Option 2: UTRAN Cell Identity
Option 3: Handover Reference Number
Option 4: UE: User Equipment Capability
Explanation: During a relocation from UTRAN to GERAN Iu-mode for Circuit Switched (CS) services, the Radio Network Controller (RNC) may include the GERAN Classmark Information Element (IE) in the RELOCATION REQUIRED message if this information is available. This is crucial because the GERAN Classmark provides necessary details about the UE's capabilities that are compatible with GERAN, ensuring a successful relocation process.