Which two are characteristics of an IPv6 multicast address？（）

• A、First （most significant ） octet is FF in hex
• B、Starts with a prefix of FE80 to FEBF in hex
• C、Starts with a prefix of FECO to FEFF in hex
• D、Second octet contains a 4-bit multicast scope field
• E、Last 64 bit contains the modified MAC address of the Ethernet interface
• F、Is allocated from the unicast address space