What does the command “svc_journalctl -f -g “st_io_monitor”” do?

What does the command “svc_journalctl -f -g “st_io_monitor”” do?
A . Retrieves log messages from the specified error and watches for re-occurrence
B . Ignores log messages from the specified error and re-occurring errors
C . Rotates the log based on the specified error
D . Deletes all logs before the specified error

Answer: B