need clarity on netbackup questions

Hi ,

Can anyone please help me on below qustions answer:

1. What is command to list media servers in Solaris10 netbackup master server

2. How many master server/s can be hold by one EMM server?

3. What is Sybase version of Netbackup 7.0 EMM?

4. Netbackup Vmware backups are at what level(file level or block level) [ As per my understanding, if we are taking backup of *.vmdk, then it is at file level, and we are taking backup through vmware backup host then it should depends whether BLIB is selcetd then it is of block level] , please confirm if i am correct?  

5. Difference between HCART and LTO?

Rgds,

Rajkumar Baniwal