What is the location of the ADR base?

The environmental variable oracle_Base is set to /u01/app/oracle and oracle_home is set to
/u01/app/oracle/product/12.1.0/db 1.
You want to check the diagnostic files created as part of the Automatic Diagnostic Repository (ADR). Examine the initialization parameters set in your database.
NAMETYPEVALUE
audit_file_deststring/u01/app/oracle/admin/eml2rep/adump background_dump_deststring core_dump_deststring
db_create_file_deststring db_recovery_file_deststring/u01/app/oracle/fast_recovery_area diagnostic_deststring What is the location of the ADR base?

A.
It is set to/u01/app/oracle/product:/12.1.0/db_1/log.

B.
It is set to /u01/app/oracle/admin/enl2r&p/adump.

C.
It is set to /u01/app/oracle.

D.
It is set to/u01/app/oracle/flash_recovery_area.