Which statement is true about the EJB 3.0 stateful session bean?

Which statement is true about the EJB 3.0 stateful session bean?

A.
Its conversational state is retained across method invocations and transactions.

B.
Its conversational state is lost after passivation unless the bean class saves it to a database.

C.
Its interceptors and their instance field values are NOT part of the conversational state of the
bean.

D.
Its conversational state is retained across method invocations but NOT across transaction
boundaries.