释放SessionBean使用的某些资源或者刷新EntityBean的缓存的代码一般实现在哪个方法中（） A: ejbActivate B: ejbPassivate C: ejbRemove D: ejbStore E: ejbLoad

A developer is designing the presentation tier for a web application that relies on a complex session bean.The session bean is still being developed and the APIs for it are NOT finalized. Any changes to the sessionbean API directly impacts the development of the presentation tier.  Which design pattern provides a meansto manage the uncertainty in the API？（） A: View Helper B: Front Controller C: Composite View D: Intercepting Filter E: Business Delegate