You have just added a CD-ROM drive (/dev/hdd) to your system and have added it to your fstab.

Typically you can use which of the following commands to mount media in that drive to /mnt/cdrom?

A.
mount /dev/cdrom /mnt/cdrom

B.
mount /dev/cdrom

C.
mount -t cdrom/dev/cdrom/mnt/cdrom

D.
mount /mnt/cdrom

E.
automount/mnt/hdd/mnt/cdrom

Explanation/Reference:
mount can work with either devicename or mountpoint if the device was added in /etc/fstab (and the mountpoint exists)
(and /dev/cdrom is not the correct devicename)