which directory should you put your callout scripts on your RAC nodes?

In which directory should you put your callout scripts on your RAC nodes?

A.
$ORACLE_HOME/opmn/conf/

B.
$ORA_CRS_HOME/opmn/conf/

C.
$ORACLE_HOME/racg/usrco/

D.
$ORA_CRS_HOME/racg/usrco/