The following description of the star network topology is wrong ______ . (Multiple choices)

The following description of the star network topology is wrong ______ . (Multiple choices)
A .  Star topology is easy to maintain
B .  In a star topology, the failure of a certain line does not affect computer communication under other lines
C . The star topology has high robustness and there is no single point of failure
D .  Because the network with star topology is a shared bus bandwidth, when the network load is too heavy, it will cause performance degradation

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Answer:   CD