Which two functions of an NSSA an OSPF network design are true? (Choose two)

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

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Answer: C,E