Which step is critical while calculating sizing for an IBM Tivoli Netcool/OMNIbus system?

Which step is critical while calculating sizing for an IBM Tivoli Netcool/OMNIbus system?

A.
Determine the appropriate method for migration.

B.
Determine the number of events that will occur per hour.

C.
Determine the number of users configured withinOMNIbus.

D.
Determine the number of probes attached to theObjectServer.