After receiving the air interface switch command, the UE initiates the reestablishment and receives the message that the rebuild is rejected. What are the possible reasons for the failure of the entire process? (Multiple choice)

After receiving the air interface switch command, the UE initiates the reestablishment and receives the message that the rebuild is rejected. What are the possible reasons for the failure of the entire process? (Multiple choice)
A . Reconstructing the target cell without context information of the UE
B . The reconstruction target cell may be a third-party cell
C . Switching target cell channel fluctuations cause random-access failure
D . The source cell initiates a handover cancellation process.

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Answer: ABC