BE 2012 for VMware with RALUS for VM

Hi,

Following were the infra details:-

1. VMware ESXi (2 no.)

2. VCenter.

3. VMotion is enabled.

4. four no. of VM for SAP and database is DB2 which is running on RHEL6.5

5. one VM for Zimbra.

We have made the solution using BE 2012 for taking backup of all the VMs along with the GRT.

Now, please , help with the following queries:-

a. For VM backup 2 no. of VMware host licesne will work?

b. A windows agent license for VCenter.

c. For GRT which agent is required for DB2 database's file restoration?

d. For the VM where Zimbra is situated, which agent is required for GRT restoration.

Any other requirement for technical point of view.

Thanks.