Which two are effects of connecting a network segment that is running 802.1D to a network  segment that is running 802.1w？（）

• A、the entire network switches to 802.1D and generates BPDUs to determine root bridfe status.
• B、A migration delay of three seconds occurs when the port that is connected to the 802.1D bridge comes up
• C、The entire network reconverges and a unique root briddge for the 802.1D segment， and a root bridge for the 802.1W segment， is chosen
• D、the first hop 802.1w switch that is connected to the 802.1D runs entirely in 802.1DCompatibility mode and converts the BPDUs to either 802.1D or 802.1W segments of the network
• E、Classic 802.1D timers， Such as forward Delay and Max-age， will only be used as a backup， and will not be necessary if point-to-point links and edge prots are properly identified and set by the administrator.