※This sample exam is different from those that appear in the actual OSS-DB Exam.
postgresql.conf file contains a variety of settings for the PostgreSQL database cluster. After changing the configuration file, there are parameters that become effective by reloading the file and parameters that require restarting the database.
The former, for example pg_ctl reload, the latter is enabled by, for example, pg_ctl restart.
Parameters can be only one set per line.
# is a symbol that is used to comment, than the right-hand side it becomes a comment. If you put the beginning of the line, the entire line is a comment line.
But from version 9.4 ALTER SYSTEM command has been added, change of this is written to a file called postgresql.auto.conf, set the contents of the postgresql.auto.conf takes precedence over postgresql.conf.
Therefore, the correct answer is D.