In different scenarios, RSTP provides different protection functions, which is wrong? (Multiple choice)

In different scenarios, RSTP provides different protection functions, which is wrong? (Multiple choice)
A . After the TC-BPDU attack defense function is enabled, the number of times that the switching device processes TC BPDU can be configured.
B . Root protection is configured on the root port.
C . After the BPDU guard function is enabled on the switch, if the edge port receives the RST BFDU, the edge port will be set to non-edge port and the spanning tree calculation will be performed again.
D . Loop protection is effective on the specified port configuration.

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Answer: BD