Exam Certified Platform App Builder topic 1 question 515 discussion

C. Lookup relationship: A Lookup relationship is suitable for scenarios where a record in one object is associated with a single record in another object, but the relationship is not mandatory and does not enforce ownership or cascade deletions. In this case, each new Realtor (child record) would have a Lookup field to the experienced Realtor (parent record), indicating the mentor they report to. This setup allows one experienced Realtor to be associated with multiple new Realtors while each new Realtor is linked to only one experienced Realtor.

Option D make sense since parent field is required in child

If we delete the experienced Realtor, we still need to keep a new Realtor. So this is not a master detail (D) for sure. I think it is C

I think it is D, cos is required field and need to be the same realtor for a probationary period. C it is possible too, but you need to define a lookup as required and not allow changes by VR.

Like wandering said, cos its just one object you cant master detail itself. so the only one that makes sense is C

Based on Based on https://trailhead.salesforce.com/trailblazer-community/feed/0D54S00000A7imFSAR I think it is Lookup (C)