C & D
You can’t use long text area, multi-select picklist, Description fields, system fields like Last Activity, cross-object formula fields, and lookup fields in the field column of roll-up summary filters.
If a roll-up summary field doesn’t contain cross-object field references or functions that derive values on the fly, such as NOW or TODAY, it can calculate the values of formula fields.
https://help.salesforce.com/articleView?id=fields_about_roll_up_summary_fields.htm&type=5
C,D
A is incorrect because: A roll-up summary field can trigger workflow rules and field validations.
https://help.salesforce.com/s/articleView?id=sf.fields_about_roll_up_summary_fields.htm&type=5
C & D: Roll-up cannot be performed on formula fields that use cross-object references or on-the-fly calculations such as NOW()
https://developer.salesforce.com/forums/?id=9060G0000005kgJQAQ
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