What are the reasons for the failure to prepare for handover within EUTRAN? (Multiple choice)

What are the reasons for the failure to prepare for handover within EUTRAN? (Multiple choice)
A . Inter-cell handover request is rejected
B . The target station rejects the handover request from the MME when handover through the S1 port.
C . The target site rejects the handover request from the source station when handover through X2 port
D . The same station handover source cell does not receive the UE context release request from the target cell.

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Answer: ABC