among the following, what are the types of entity beans?
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JMS
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JAXM
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BMP
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CMP
Entity beans in EJB 2.x support two persistence mechanisms: BMP (Bean-Managed Persistence) where the developer writes all database code, and CMP (Container-Managed Persistence) where the container handles persistence automatically. Options C and D correctly identify these. JMS and JAXM (A and B) are messaging technologies unrelated to entity bean persistence.
Entity beans come in two persistence-management flavors: BMP (Bean-Managed Persistence), where the developer writes the persistence code, and CMP (Container-Managed Persistence), where the EJB container handles it automatically. JMS and JAXM are messaging technologies related to message-driven beans, not entity bean types.