Which of the following statements are true

It is possible that on some systems with free disk space a regular file cannot be created due to the lack of space for inodes in the inode table.

In tmux panes can be divided into windows.

The command tar $-$zcf somefile somedir$/$ will archive but also compress the directory somedir and its content in a file somefile.

The command kill with only PID indicated sends by default signal with value $9($SIGKILL$)$ to a process.