What is the primary difference between the relational database (RDB) and object-oriented database (OODB) models?

What is the primary difference between the relational database (RDB) and object-oriented database (OODB) models?
A. OODB supports multiple objects in the same database, whereas RDB supports only tables.
B. RDB supports only E.F. Codd’s rules, whereas OODB does not support them.
C. OODB incorporates methods with data structure definition, whereas RDB does not allow this.
D. RDB allows the definition of relationships between different tables, whereas OODB does not allow this.

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