You want to verify the PGP signature of all headers and
signatures associated with an RPM package. Which of the
following commands will you use to accomplish the task?
Each correct answer represents a complete solution. Choose all
that apply.

A.
rpm -K

B.
rpm –checksig

C.
rpm -e

D.
rpm -V

Explanation:
QUERYING AND VERIFYING PACKAGES:

rpm {-q|–query} [select-options] [query-options]
rpm {-V|–verify} [select-options] [verify-options]
rpm –import PUBKEY …
rpm {-K|–checksig} [–nosignature] [–nodigest] PACKAGE_FILE …

INSTALLING, UPGRADING, AND REMOVING PACKAGES:

rpm {-i|–install} [install-options] PACKAGE_FILE …
rpm {-U|–upgrade} [install-options] PACKAGE_FILE …
rpm {-F|–freshen} [install-options] PACKAGE_FILE …

rpm {-e|–erase} [–allmatches] [–nodeps] [–noscripts][–notriggers] [–repackage] [–test] PACKAGE_NAME …