User permissions to mount CDROM

[Viswas Nair]

I have been trying to figure out how to give users to mount CD rom and have
been largely unsuccessful. Here are a few things I tried:
1) Added user to the 4th field (options) in /etc/fstab
2) Added vfs.usermount=1 to  sysctl.conf
3) Created a group called optical and added the root and alpha to it
4) Added following lines to devfs,conf :
own /dev/acd0 root:optical
perm /dev/acd0 0770
own /dev/acd1 root:optical
perm /dev/acd1 0770
5) Rebooted machine and tried to mount /dev/acd0 into /cdrom and it failed
with the message:
got the error message: /dev/acd0