Universal Container's object model uses a Work Order / Work Order Line Item (parent/child) relationship.

Resource Preferences are supported on Work Order Line Items, which makes the parent/child Work Order pattern fully usable for jobs that require specific resources with specialized skills.

Option C is correct. Resource Preferences can be added directly to the Work Order Line Item, with type 'Required' or 'Preferred', referencing the Service Resource(s) qualified for the specialized work. The scheduling engine respects those preferences when picking candidates for the WOLI's Service Appointment.

Option A is incorrect because Resource Preferences are supported in Complex Work scenarios, including WOLI-based hierarchies.

Option B is incorrect because Resource Priority ranks all resources globally; it doesn't target specific resources for a specific Work Order Line Item.

Option D is incorrect because Resource Preferences are supported on WOLI out of the box and do not require redesigning the data model.