单项选择题You have just configured the network interface on systemA . The following information is From systemB, you test the network connectivity by sending ICMP ECHO_REQUEST packets to systemA. The following message is displayed: no answer from systemA What is most likely the problem?()
A. The interface is not plumbed.
B. The interface is not configured.
C. The interface does not have valid routes configured.
D. The interface is not marked as