Question: What happens if the Target eNodeB fails to allocate resources for any of the requested EPS Bearers during an Inter RAT handover from UTRAN Iu mode to E-UTRAN?
Option 1: The UE context is established in the target MME/eNodeB, and resources are allocated.
Option 2: The Handover procedure is retried with a reduced number of EPS bearers.
Option 3: The Target eNodeB sends a Handover Failure (Cause) message to the Target MME, which then clears any reserved resources for the UE.
Option 4: The Source RNC/SGSN releases all resources allocated for the handover.
Explanation: When the Target eNodeB fails to allocate resources for any of the requested EPS Bearers, it sends a Handover Failure (Cause) message to the Target MME. This causes the Target MME to clear any reserved resources for the UE, effectively rejecting the handover.