Which two statements best describe EtherChannel？（）
- AEtherChannel technology helps aggregate traffic grouping multiple，full-duplex point-to-point linkstogether
- BEtherChannel technology is based on the 802.1 IEEE stand
- CEtherChannel can aggregate up to 800 Mbps，8 Gbps，or Gbps of aggregate bandwidth for a Fast EtherChannel，Gigabit EtherChannel，or 10 Gigabit EtherChannel connection respectively
- DEtherChannel is defined for Rapid Spanning Tree for faster convergence