Which steps take place via the shadow instance?

You have chosen the "Advanced" option during the main configuration of the SUM tool.

Which steps take place via the shadow instance? There are 2 correct answers to this question.
A . Conversion of application tables (PARCONVJJPG)
B . Activation of dictionary objects (ACT_UPG)
C . Switch to new repository (EU_SWITCH)
D . Modification adjustment (SPDD)

Answer: B, D