What Is True Regarding the Configuration of Yum

What is true regarding the configuration of yum?

A) Changes to the repository configuration become active after running yum confupdate Changes to the repository configuration become active after running yum confupdate
B) Changes to the yum configuration become active after restarting the yumd service Changes to the yum configuration become active after restarting the yumd service
C) The configuration of package repositories can be divided into multiple files
D) Repository configurations can include variables such as $basearch or $releasever Repository configurations can include variables such as $basearch or $releasever
E) In case /etc/yum.repos.d/ contains files, /etc/yum.conf is ignored In case /etc/yum.repos.d/ contains files, /etc/yum.conf is ignored