Which of the following programs is typically used to query installed debian packages?

(Please select TWO that apply)

A.
dpkg

B.
apt-cache

C.
apt-conf

D.
dselect

Explanation:
dselect is the console frontend for the apt family, and dpkg the commandline tool for package administration.
apt-cache is used to manipulate the apt cache, and apt-conf is not a command.