Regarding the generation of TCN BPDUs, which of the following statements are correct

Regarding the generation of TCN BPDUs, which of the following statements are correct
A . STP-enabled non-root bridge switch If a port is connected to a PC, when the port enters the Forwarding switch, no TCN BPDU will be generated
B . If the designated port link of a switch in the network is broken, the switch must generate TCN BPDUs
C . If the Alternate port link of a switch in the network is broken, the switch will not generate TCN BPDUs
D . When a port of the switch is selected as the designated port or root port, the switch will immediately send TCNBPDU

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Answer: C