Is it possible to set Audit_trail parameter to both DB and OS in Oracle database

In Oracle database ,we can direct audit records to either db , os or in xml file by using the below command:

ALTER SYSTEM SET AUDIT_TRAIL= DB SCOPE=SPFILE;

But is it possible to direct audit records to both db and os(both) like the below command which results in error:

 ALTER SYSTEM SET AUDIT_TRAIL= DB,OS SCOPE=SPFILE;