In the image, there are two nodes communicating via two access points that are bridging together two segments. In the middle packet, under the left access point, the Address 4: field is blank. If this packet is destined for the computer on the right side of the image, what must be the value of Address field 4 in this middle packet?

A.
ABCD

B.
6789

C.
2345

D.
1234

E.
CDEF