To Improve STP Running Stability, a Network Administrator Wants to Configure

Multiple Choice

To improve STP running stability, a network administrator wants to configure some STP features or protection mechanism on switches. Which of the following configuration roadmaps is correct?

A) Configure the user access port as an edge port to prevent the user from connecting to the switch on this port.
B) Configure root protection on the user access port to ensure that the user does not connect to a switch with a higher priority.
C) Configure loop protection on positions where loops have occurred so that loops are always blocked.
D) Configure BPDU protection so that the switch checks the validity of each received BPDU to prevent attacks of forged BPDUs.