Refer to the exhibit.A junior network administrator was given the task of configuring port security on SwitchA to allow only PC_A to access the switched network through port fa0/1. If any other device is detected， the port is to drop frames from this device. The administrator configured the interface and tested it with successful pings from PC_A to RouterA， and then observes the output from these two show commands. Which two of these changes are necessary for SwitchA to meet the requirements？（）

• A、Port security needs to be globally enabled.
• B、Port security needs to be enabled on the interface.
• C、Port security needs to be configured to shut down the interface in the event of a violation.
• D、Port security needs to be configured to allow only one learned MAC address.
• E、Port security interface counters need to be cleared before using the show command.
• F、The port security configuration needs to be saved to NVRAM before it can become active.