You are performing an SAP S/4HANA conversion. When does the silent data migration (SDM) take place?

Which steps can SUM perform during an SAP S/4HANA conversion? Note; There are 2 correct answers to this question.

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.
Response:

Which step can be optimized when you provide the MIGRATE_DT_DUR.XML file to SUM?

What is the different between the benchmaking and the repetition option of the Database Migration Option (DMO) of SUM?