Question: For a CS fallback to UTRAN procedure, where the LAI of the UTRAN cell matches the one received in the combined Attach procedure in the EUTRA cell, which condition determines the application of the outlined procedures?
Option 1: UE supports only PS HO from UTRAN to EUTRA
Option 2: UE supports (EUTRA) RRC connection release with redirection and Multi Cell System Information to UTRAN
Option 3: UE is in idle mode in the EUTRA cell before CS call request
Option 4: UE has an ongoing data session in the EUTRA cell
Explanation: The correct answer directly aligns with the specified condition for applying procedures during a CS fallback to UTRAN, highlighting the importance of RRC connection release with redirection and Multi Cell System Information support for seamless handover from EUTRA to UTRAN, ensuring continuity of service for CS calls.