A. The two different versions can coexist happily so you can upgrade in order you want however the safest option may be the following schedule:
- Upgrade a BDC from 3.51 to 4.0
- Leave it for a week and check it is OK
- Promote the BDC to the PDC
- Leave for another week and check everything is OK
- Upgrade the other BDC's to 4.0
- Promote the old PDC back to the main PDC (the current PDC will automatically be demoted to a BDC)
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