The layer of the OSI model known as Layer 7 is the application layer

Which of the following JPA-related statements is false?

a. You can update an existing entity by modifying its entity object in the context of a transaction. b. Once a transaction is committed, the changes to the entity are saved to the database. c. You can delete an existing entity. d. When you commit a transaction the entity is kept as a backup in the database.

Explain why it is important to define data types in Access.

What will be an ideal response?