The ETH_LOS or LINK_ERR alarm occurs on a single Ethernet port of a multi-interface Ethernet board, and the service is interrupted. The possible reasons are: the working mode of the Ethernet port does not match or the interface rate is inconsistent, and the hardware failure of the optical module. Which of the following is also possible?

The ETH_LOS or LINK_ERR alarm occurs on a single Ethernet port of a multi-interface Ethernet board, and the service is interrupted. The possible reasons are: the working mode of the Ethernet port does not match or the interface rate is inconsistent, and the hardware failure of the optical module. Which of the following is also possible?
A . Fiber connection error
B. Ethernet port property setting error
C. The MTU parameter setting is too small
D. SDH line VC4 channel failure

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Answer: A