When You Used JPA in This Chapter, You Interacted with an Existing

When you used JPA in this chapter, you interacted with an existing database via classes that the NetBeans IDE generated from the XE "database schema" database's schema. You used the NetBeans Entity Classes from Database… option to add to your project classes that represented the database tables. Together, these classes and the corresponding settings are known as a ________ unit.

A) perseverance
B) perpetual
C) sticky
D) persistence.