In the X2 handover process in the LTE system, if a re-establishment occurs, which cell may be re-established? (Multiple choice)

In the X2 handover process in the LTE system, if a re-establishment occurs, which cell may be re-established? (Multiple choice)
A . Source cell
B . Target cell
C . Third party community
D . Other cells in the source base station

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Answer: ABD