Regarding the stub area in the OSPF protocol, the following statement which is correct? (Multiple Choice)

Regarding the stub area in the OSPF protocol, the following statement which is correct? (Multiple Choice)
A . ASBR cannot exist in the stub area.
B . The virtual link cannot traverse the stub area.
C . stub area is not allowed to inject type7 LSA
D . The backbone area cannot be configured as a stub area.

Answer: ABCD