Which following statements are correct

MariaDB configured to enable the slow query log and to use a table as an output for it$,$ will use the slow$\_$log table in the mysql database to keep all the slow mysql queries from all other databases in order to easily identify them.

When writing a path in bash double tapping tab will display all the alternatives that match the current path entered without breaking the command itself.

The $PATH variable can be appended but not prepended.

The $$0$ contains a filename of a bash script file.