What is a true statement regarding roll-up summary fields? Choose 2 answers

Managers at Universal Containers want a quick way to create additional accounts to form a hierarchy from a Parent Account record. They want to auto-populate five fields based on the parent to make it easier for users to create the child accounts quickly.
What should the app builder recommend?

The convert button on leads should NOT appear until the lead status picklist is set to a qualified. What should an app builder suggest to meet these requirements?

Universal containers requires that all users specify a contract is sent on each opportunity prior to marking it as closed won. uc wants to be able to report on how many opportunities have sent contracts compared to how many have a missing contract when the opportunities closed. what type of field should an app builder configure to fulfill this requirement ?

Universal Containers is piloting new features in an existing sandbox and wants to prevent outbound email sends during testing.
What should the app builder do to meet the requirement?