You have a Mac OS X v10.6.8 computer that has several user accounts. If you install OS X Mountain Lion without first erasing the target volume, what will happen
to the 10.6.8 operating system and the existing user accounts?

A.
The Installer archives the 10.6.8 OS and installs Mountain Lion. It maintains the user accounts.

B.
The Installer upgrades the 10.6.8 OS to Mountain Lion. It maintains the user accounts.

C.
The Installer replaces the 10.6.8 OS with Mountain Lion. It archives the user accounts, but they can be restored manually.

D.
The Installer erases the 10.6.8 OS and installs Mountain Lion. It archives the user accounts, but they can be restored manually.