Which are the key factors that you should consider before converting a single-Instance database Oracle Real Application Cluster…?

Which are the key factors that you should consider before converting a single-Instance database
Oracle Real Application Cluster (RAC) database to guarantee a successful media recovery?

A.
If the database is in archive log mode, the archive file format requires a thread number.

B.
The archive logs from all nodes must be accessible to all nodes in the cluster database.

C.
The storage option must be Automatic Storage Management (ASM).

D.
All database files must be migrated to Oracle Managed Files (OMF).

Explanation:
Issues for Converting Single Instance Databases to Oracle RAC

Backup procedures should be available before conversion takes place.
Archiving in Oracle RAC environments requires a thread number in the archive file format.
The archived logs from all instances of an Oracle RAC database are required for media recovery.
By default, all database files are migrated to Oracle Managed Files (OMF).
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Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 11 – 24