Salesforce Field Service schedules Service Resources, not Assets. To bring physical equipment into the scheduling engine, the equipment must be modeled as a Service Resource so the engine can check its availability, capacity, and skills.

Option D is correct. To include cranes, excavators, or any other equipment in scheduling, ACME must create Service Resource records for them (typically with a 'Resource Type' such as 'Equipment'). These records consume Field Service licenses, and once configured they participate in the candidate evaluation, capacity, and optimization just like a human technician.

Option A is incorrect because there is no 'Use for Scheduling' Boolean on the Asset object; Assets and Service Resources are separate concepts.

Option B is incorrect because a lookup field does not make the Asset part of the scheduling engine --- it is just a reference.

Option C is incorrect because the Dispatcher Console does not expose an 'Include Assets' toggle on the Schedule action.