Which of the following are shared distribution tree characteristics（）
- AMemory requirements are higher for shared distribution tree than for source distributiontree.
- BCreates a tree from a central RP to all last-hoprouters.
- CUses a rendezvous point.
- DAn optimal path is created between each source router and each last-hoprouter.
- EPlace（S，G）entry in each router’smulticast routing table.
- FPlace（*，G）entry in a router’smulticast routing to table.