Which two directories are used during the installation of Grid Infrastructure and Oracle Database (with the RAC option)?

Which two directories are used during the installation of Grid Infrastructure and Oracle Database
(with the RAC option)?

A.
ORACLE_HOME

B.
C:\ORACLE

C.
Grid Infrastructure Oracle Home

D.
ORACLE_GRID

Explanation:
A: The Oracle RAC database software is installed from the same Oracle Database
11g installation media. By default, the standard Oracle Database 11g software installation process
installs the Oracle RAC option when OUI recognizes that you are performing the installation on a
cluster. OUI installs Oracle RAC into a directory structure that is referred to as Oracle_home. This
home is separate from the home directories of other Oracle software products installed on the
same server.
D: Example:
The apply patch output is Oracle Interim Patch Installer version 11.2.0.3.0
Copyright (c) 2012, Oracle Corporation. All rights reserved.
Oracle Home : /oracle_grid/product/11.2.0.3/grid
Central Inventory : /opt/oracle/oraInventory
from : /oracle_grid/product/11.2.0.3/grid/oraInst.loc
OPatch version : 11.2.0.3.0
OUI version : 11.2.0.3.0
Log file location : /oracle_grid/product/11.2.0.3/grid/cfgtoollogs/opatch/o