B and C
Please refer following.

When you update a roll-up summary field, Salesforce triggers automation that runs off update triggers on the field’s object. Because Salesforce Billing uses many automated processes, we recommend thoroughly testing custom roll-up summaries and custom automation. That way, you reduce the risk of triggering a large number of automated processes, which can impact performance.
https://help.salesforce.com/s/articleView?id=sf.blng_automation_guide_rollup.htm&type=5

B and C

Question 72 instructs to pick 2 answers but only one is picked