The execution of the show interfaces command yields the following as a part of its output:
Ethernet 0/0 is up, line protocol is down
Which of the following can be determined from this output?
A. the link is not functional due to a Data Link layer issue
B. the link is fully functional
C. the link is not functional due to a Physical layer issue
D. the link is not functional due to both a Physical layer and a Data Link layer issue