One way to obtain a base backup for use with PITR is to use a non-exclusive low-level backup. Non-exclusive low-level backups use the low-level API to take backups.
Connect to a running PostgreSQL server, execute the pg_start_backup() function, then backup (copy) the database cluster directory and execute the pg_stop_backup() function. Note that you must be a superuser or a user who has been granted EXECUTE permission on the function. In non-exclusive low-level backups, you need to create a file at the backup destination.

If you are using backup_label and tablespaces to store backup information, create a file called tablespace_map to store tablespace information.
The file contains the output of the pg_stop_backup() function.
Exclusive and non-exclusive modes exist, and the default is to run in exclusive mode, which is not officially recommended.

The correct answers are B and E because it is a question to choose the wrong ones.