1Z0-895 Question #4: Real Exam Question with Answer & Explanation

A developer implements a system in which transfers of goods are monitored. Each transfer needs a unique ID for tracking purposes. The unique ID is generated by an existing system which is also used by other applications. For performance reasons, the transaction that gets the unique ID should be as short as possible. The scenario is implemented in four steps which are implemented in four business methods in a CMT session bean: These methods are called by the addTransfer method of a second CMT session bean in the following order: checkGooods, getUniqueId, checkAmount, storeTranfer Assuming no other transaction-related metadata, which is the correct set of transaction attributes for the methods in the session beans?