The RSTP protocol provides a variety of protection functions. For example, when the border port is configured to be protected, the processing method after the border port receives the BPDU message is:

The RSTP protocol provides a variety of protection functions. For example, when the border port is configured to be protected, the processing method after the border port receives the BPDU message is:
A . Forward BPDU packets as required
B . Obtain related information after BPDU message
C . Close the port
D . Directly discard BPDU packets

Answer: C