What apt-get command would you run to download the latest list of packages, but not the packages themselves?

You have not run apt-get on a system for some time, but it has been run on the system before.
What apt-get command would you run to download the latest list of packages, but not the
packages themselves?

A.
apt-getbuilD.dep

B.
apt-get mirror-select

C.
apt-get update

D.
apt-get upgrade

E.
apt-get dist-upgrade

Explanation:
To automatically upgrade all installed packages to the latest available version, issue the following
command:
apt-get upgrade