Licensing of Backup Exec

Hi,

in customer that have this scenario bellow:

1 Host VMware with 4 VM's:

VM1 = SQL

VM2 = SQL

VM3 = Exchange

VM4 = AD;

And he has EMC Data Domain to do backup to disk.

My mode of licensing bellow is correct ?

- Deduplication option, to permit do Backup To Disk using EMC Data Domain. Or none option is necessary to use EMC Data Domain ?

- 4 agents of Application and Database to protect all of 4 applications.

Regards