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.