Which of the following statements about the BeanFactoryPostProcessor are true? (select one or several answers)

Which of the following statements about the BeanFactoryPostProcessor are true? (select one or several answers)
A . Allows for the transformation of Spring bean definitions before the beans are instantiated
B . Allows for the transformation of Spring beans after the beans have been instantiated
C . Detects annotations such as @PostConstruct and @PreDestroy and then invokes appropriate behavior
D . The <context:property-placeholder /> tag causes a BeanFactoryPostProcessor to be created

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Answer: A,D