MCGfailure 的触发原因有哪几种. ( )
A.upon T310expiry
B.upon T312expiry
C.uponrandom access problem indication from MCG MAC while neither T300, T301, T304nor T311 is running
D.uponindication from MCG RLC that the maximum number of retransmissions has beenreached for an SRB or DRB
正确答案是ABCD