Which of the following are shared distribution tree characteristics？ （Choose all that apply.）（）

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