What two files are required to make a module usable?

Magento 2’s architecture uses code to bootstrap a custom module that resides in app/code.

What two files are required to make a module usable? (Choose two.)
A . Helper/Data.php
B . etc/config.xml
C . etc/module.xml
D . registration.php

View Answer

Answer: CD

Explanation:

Reference: https://inchoo.net/magento-2/how-to-create-a-basic-module-in-magento-2/