When is a new system required to perform an upgrade from IBM Tivoli Storage Manager (TSM) V5.x to V6.2?

A.
if IBM DB2 is not already installed

B.
if the existing TSM server is at V5.5

C.
if the existing IBM DB2 installation has to be extended

D.
if the existing server is on one of the platforms that are not supported for the new TSM server