Which reason for this error is most likely true?

An engineer enters the commandswitchport port-security in configuration mode on a switch. The command fails and displays the output Command rejected: GigabitEthernet0/1 is a dynamic port. Which reason for this error is most likely true?
A. The port is in Layer 3 mode.
B. Port security is not enabled globally.
C. Sticky MAC addresses are disabled on the port.
D. The port is not configured as an access port.
E. The port is part of an existing port channel.

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