What are two functions of an NSSA in an OSPF network design? (Choose two

What are two functions of an NSSA in an OSPF network design? (Choose two.)
A. It overcomes issues with suboptimal routing when there are multiple exit points from the area.
B. It allows ASBRs to inject external routing information into the area.
C. An ASBR advertises Type 7 LSAs into the area.
D. An ABR advertises Type 7 LSAs into the area.
E. It uses opaque LSAs.

Answer: BC