You have just configured the network interface on systemA. The following information is displayed pertaining to the network interface on systemA:

lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1 inet 127.0.0.1 netmask ff000000
rtls0: flags=1004842<BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500 index 2 inet 192.168.1.31 netmask ffffff00 broadcast 192.168.1.255 ether 0:10:dc:a3:7e:4b

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 is not marked as UP

D.
The interface does not have valid routes configured.