【多选题】

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, T304norT311 is running
D)uponindication from MCG RLC that the maximum number of retransmissions has beenreachedfor an SRB or DRB