A developer wants to achieve the following two behaviors for an EJB 3.0 session bean: (1) If the client calls a business method with a transaction context, the container will invoke the enterprise…

A developer wants to achieve the following two behaviors for an EJB 3.0 session bean: (1) If the client calls a business method with a transaction context, the container will invoke the enterprise bean's method in the client's transaction context. (2) If the client calls a business method without a transaction context, the container will throw the javax. ejb. EJBTransactionRequiredException. Which transaction attribute should be used?