A.Domain advertisements
B.Advertisement requests from clients
C.Subset advertisements
D.Summary advertisements

A.The VLAN ID of all known VLANs，the management domain name，and the total number of trunk links on the switch.
B.The VLAN ID of all known VLANs，a 1-bit canonical format （CF1 Indicator），and the switch  configuration revision number.
C.The management domain name，the switch configuration revision number，the known VLANs，  and their specific parameters.
D.A 2-byte TPID with a fixed value of 0x8100 for the management domain number，the switch  configuration revision number，the known VLANs，and their specific parameters.
E.None of the other alternatives apply.