What should be the effect of this command?

Error
in this question:
As root, you type apt-get update on a Debian system.

What should be the effect of this command?
A . The APT utilities update themselves, ensuring that you’re using the latest version of AP
C . The APT utilities download all available upgrades for your installed programs and install them on your system.
D . The APT utilities deliver information about the latest updates you’ve made to the APT Internet repositories, enabling you to share your changes with others.
E . The APT utilities retrieve information about the latest packages available so that you may install them with subsequent apt-get commands.
F . None: update is an invalid option to apt-get.
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Answer: D

I think the correct answer is E not D.
if it is D, please keep me informed with more details