Final answer:
Subtype entities in data modeling can indeed be either exclusive or inclusive, making the statement true.
Step-by-step explanation:
The statement in question is true. In data modeling, especially in Entity-Relationship (ER) modeling, an entity can have subtypes, which are entities that inherit attributes and relationships of their parent entity. These subtype entities can be classified as being exclusive or inclusive.
An exclusive subtype means that an instance of the supertype can only be one of the subtypes at any time, whereas an inclusive subtype means that the instance can be more than one subtype at the same time or none at all if it adheres strictly to the attributes of the supertype.