Which statements are correct? There are 2 correct answers to this question.

Which statements are correct? There are 2 correct answers to this question.
A . Real Application Clusters also supports all Oracle backup and archiving features that are available in single instance Oracle databases.
B . SAP only supports RAC on systems with a cluster filesystem.
C . Migration to Oracle Real Application Clusters is relatively easy where unloading and loading of data isnecessary.
D . While with a standard cluster solution you effectively use just one active database instance, RAC makes itpossible to use several instances simultaneously.

Answer: A,D