Which of the following commands should the systems administrator run NEXT to resolve this issue?

A systems administrator installs a simple package, but the Linux system returns the following error: rpmdb open fails. To verify if there is a problem in the RPM database, the systems administrator runs the following command:
Which of the following commands should the systems administrator run NEXT to resolve this issue?
A. cd/var/lib/rpm; rpm –rebuilddb ; rm -f _db*; yum clean all
B. cd/var/lib/rpm; rpm -qd; rpm –rebuilddb; yum clean all
C. cd/var/lib/rpm; rpm -qa; rm -f _db*; yum clean all
D. cd/var/lib/rpm; rm -f _db*; rpm –rebuilddb; yum clean all