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ABDF is correct:
https://docs.oracle.com/database/121/ADMIN/schedover.htm#ADMIN033
A. By not specifying a destination attribute, in which case the job runs locally.
B. Remote database jobs must run as a user that is valid on the target database
D. You can specify a job credential by specifying a named credential object or by allowing the credential attribute of the job to remain NULL.
F. You can also create a destination group, which consists of a list of destinations, and reference this destination group when creating a job. In this case, the job runs on all destinations in the group.
Should be ABEF.
Here is a remote database.
D: By allowing the credential attribute of the job to remain NULL, in which case a local database job runs as the job owner. (See Table 28-1.) The job owner is the schema in which the job was created.
For D:In the docs,the description of paramter destination_name,which is using in DBMS_SCHEDULER.CREATE_JOB, memtions that "If the credential_name argument of CREATE_JOB is NULL, each destination must be preceded by a credential, in the following format:credential.destination.The credential must already exist. If the credential_name argument is provided, then it serves as the default credential for every destination that is not preceded by a credential."
ref https://docs.oracle.com/database/121/ARPLS/d_sched.htm#ARPLS72300
For G:In the docs, it says that "You define where a job runs by specifying a one or more destinations. Destinations are also Scheduler objects and are described later in this section. If you do not specify a destination, it is assumed that the job runs on the local database."
ref https://docs.oracle.com/database/121/ADMIN/schedover.htm#ADMIN-GUID-6BADB539-62DB-468D-9685-A855FC133902
Database link is not mentioned in the documentation.
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