Which of the Following Statements Is NOT True About Object-Oriented

Which of the following statements is NOT true about object-oriented databases (OODBs) ?

A) A voice mail system is an example of a groupware database.
B) An object is an item that contains data, as well as the actions that read or process the data.
C) An OODB stores unstructured data more efficiently than a relational database.
D) OODBs can store more types of data and access it faster than relational databases.