EBS supports both RAC and DataGuard configurations. There are a number of notes on the MyOracleSupport site on implementation.
Similarly, the Application Tier can also be HA enabled with a Load Balancer.
Hemant K Chitale
Thank you very much for the reply. I'm very new for this. I have experience with RAC and DG. But no experience with AppsTier.
There are AppTier steps in both Business Continuity documents for 12.1, one for 11g and another for 12c database.
Business Continuity for Oracle E-Business Suite Release 12.1 Using Oracle 12c Physical Standby Database (Doc ID 1900663.1)
Business Continuity for Oracle E-Business Release 12.1 Using Oracle 11g Release 2 Physical Standby Database (Doc ID 1070033.1)