How does a maintenance request within the phase-based process differ from a maintenance notification in...

 A maintenance request within the phase-based process differs from a maintenance notification in the standard process in that it contains an additional screening phase where requests can be accepted or rejected. In the standard process, a maintenance notification is created and processed without any screening. In the phase-based process, a maintenance request is created and submitted for screening. The screening phase allows the supervisor to review the request and decide whether to accept it or reject it. If the request is accepted, it becomes a maintenance notification and moves to the planning phase. If the request is rejected, it is closed and no further action is taken1.

The other options are incorrect because:

A maintenance request does not always use the risk-based assessment for prioritization. It can also use a predefined priority list2.

A maintenance request is not a new business object with no connection to a maintenance notification. It is a maintenance notification that is in the initiation or screening phase3.

It is not mandatory to assign a task list to the maintenance request. A task list can be assigned to the maintenance order in the planning phase4.

References: Explaining the Phase-based Process, New Phase Model for the Maintenance Processes in S/4HANA Cloud, SAP S/4HANA Cloud release of 2011 – Asset Management (Maintenance Management), Introducing Reactive Maintenance (4HH)