When an entity instance must be a member of only one sub-type, it is which of the following?

(a) Disjoint with total specialization

(b) Disjoint with partial specialization

(c) Overlap with total specialization

(d) Overlap with partial specialization

This question was addressed to me during an online interview.

This intriguing question originated from The Atomic Data Models and Business Models in section Planning Oracle Applications of Oracle

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