Refer to the exhibit.

RTA and RTB are ABRs for Area 0 and Area 1.
What is the issue with this configuration?

A.
There is no issue because OSPF will work fine in any condition.

B.
Suboptimal routing may occur because there is no Area 1 adjacency between the ABRs.

C.
This is a wrong OSPF configuration because OSPF Area 0 is a must between ABRs.

D.
If the link between RTC and RTD is down, an OSPF virtual link is required to connect ABR RTA
and RTB.