Which of the following DNS record types can the command…

Which of the following DNS record types can the command dnssec-signzone add to a zone? (Choose THREE correct answers.)

A.
ASIG

B.
NSEC

C.
NSEC3

D.
NSSIG

E.
RRSIG

Explanation:
http://linux.die.net/man/8/dnssec-signzone