When you compare the differences between half-duplex and full-duplex Ethernet,which of the following characteristics are exclusive to half-duplex?（）

• A、Half-duplex Ethernet operates in a shared collision domain.
• B、Half-duplex Ethernet operates in an exclusive broadcast domain.
• C、Half-duplex Ethernet has efficient throughput.
• D、Half-duplex Ethernet has lower effective throughput.
• E、Half-duplex Ethernet operates in an exclusive collision domain.