【多选题】
A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed. <br /> Which two are true？ （）
A、 A
B、 The echo tag handler must define the setAttribute （String key， String value） method
C、 The
D、 The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.IterationTag interface
E、 The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.DynamicAttributes interface
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