Question: Under what circumstance is the 'Extended Maximum Number of Bits per MAC-e PDU for Non-scheduled Transmission' Information Element (IE) utilized in UTRAN's Iub interface NBAP signalling?
Option 1: When initiating a new Radio Access Bearer (RAB) setup for low-speed data transmission.
Option 2: If the Node B requires a reduction in the MAC-e PDU size for scheduled transmissions.
Option 3: During handover procedures to ensure seamless connectivity.
Option 4: When the standard 'Maximum Number of Bits per MAC-e PDU for Non-scheduled Transmission' IE range is insufficient to represent the desired value.
Explanation: The correct answer reflects the scenario where the usual range for specifying the maximum number of bits per MAC-e PDU for non-scheduled transmissions is not sufficient, necessitating the 'Extended' version to accommodate larger values for efficient data transmission over the UTRAN network.