What is the function of the DSMUPGRD upgrade utility for IBM Tivoli Storage Manager V6.2 (TSM)?

A.
It is run after a new version of TSM is installed.

B.
It checks all prerequisites (disk space, memory, software level).

C.
It starts the TSM upgrade after a successful check of prerequisites.

D.
It prepares and extracts data from the database which will be migrated.

Explanation:
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