Which of the following are shared distribution tree characteristics（）

A. Memory requirements are higher for shared distribution tree than for source distributiontree.
B. Creates a tree from a central RP to all last-hoprouters.
C. Uses a rendezvous point.
D. An optimal path is created between each source router and each last-hoprouter.
E. Place（S，G）entry in each router’smulticast routing table.
F. Place（*，G）entry in a router’smulticast routing to table.