<tx:advice id="txAdvice" transaction-manager="txManager"> <tx:attributes> <tx:method name="get*" propagation="REQUIRED" read-only="true" /> <tx:method name="add*" propagation="REQUIRED" /> <tx:method name="*" propagation="REQUIRED" read-only="true" /> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="serviceMethod" expression="execution(* cn.jbit.ch09.service.*.*(..))" /> <aop:advisor advice-ref="①________" pointcut-ref="②_________" /> </aop:config> ? 在横线处应填入( )。 A. ① txAdvice ② txManager B. ① serviceMethod ② txManager C. ① txAdvice ② serviceMethod D. ① serviceMethod ② txAdvice