Which is defined as a stub area on both. Which mismatch can cause OSPF routers to lose adjacency?

Two AOS-Switches connect on VLAN 10 in OSPF Area 1, which is defined as a stub area on both. Which mismatch can cause OSPF routers to lose adjacency?
A. The administrator adds the backbone area to just one of the routers.
B. The administrator enables graceful restart, or nonstop switching, on just one of the routers.
C. The administrator enables jumbo frames on VLAN 10 on just one of the routers.
D. The administrator adds the no-summary option to Area 1 on just one of the routers.

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