What types of packages are contained in the Oracle Public YUM server?

What types of packages are contained in the Oracle Public YUM server?

A.
Base releases of Oracle and RedHat Linux distributions

B.
Base releases of Oracle Linux and extra/updates for Oracle Linux

C.
Red Hat Compatible Kernel, UEK, and Oracle database software

D.
Base release of Oracle Linux

Explanation:
The Oracle public yum server offers a free and convenient way to install the latest
Oracle Linux packages as well as packages from the Oracle VM installation media via a yum
client.
You can download the full Oracle Linux and Oracle VM installation media via
edelivery.oracle.com/linux.
Note:
Getting Started
Oracle Linux 4, Update 6 or Newer
# cd /etc/yum.repos.d
# mv Oracle-Base.repo Oracle-Base.repo.disabled
# wget http://public-yum.oracle.com/public-yum-el4.repo
Oracle Linux 5
# cd /etc/yum.repos.d
# wget http://public-yum.oracle.com/public-yum-el5.repo
Oracle Linux 6
# cd /etc/yum.repos.d
# wget http://public-yum.oracle.com/public-yum-ol6.repo
Oracle VM 2
# cd /etc/yum.repos.d
# wget http://public-yum.oracle.com/public-yum-ovm2.repo
Open the yum configuration file in a text editor
Locate the section in the file for the repository you plan to update from, e.g. [el4_u6_base]
Change enabled=0 to enabled=1
yum list

yum install firefox
You may be prompted to confirm the import of the Oracle OSS Group GPG key.