additional action must be performed in order to make this Xen guest start automatically every time the host system boots?

After the Xen guest configuration file debian.cfg has been created and successfully tested, which

additional action must be performed in order to make this Xen guest start automatically every time the host system boots?
A . It is necessary to add xendomains_auto = yes to the virtual machine configuration file.
B . It is necessary to add an entry for debian.cfg to the file /etc/xen/guesttab.
C . It is necessary to run the command xl autostart debian.cfg.
D . It is necessary to add a symbolic link to the configuration file in the /etc/xen/auto/ directory.
E . It is not possible to use Xen and its tools to start virtual machines automatically.

Answer: D