A. The routes can be advertised in type 7 LSAs. - True when NSSA
B. The area must be a stub area. - False, no external routes allowed
C. The external route advertisements have a domain scope. - Type 5 is domain scope , type 7 is translated to type 5 at ABR..
D. The area must be the backbone area. - Not a hard must, but could. Then true
I think C and D are both a bit unclear, would go for C, because to the MUST in D
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