[多选]
A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed.
Which two are true？（）

A . A element in the echo tag LTD must have the value JSP
B . The echo tag handler must define the setAttribute （String key， String value） method
C . The true element must appear in the echo tag TLD
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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A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed.
Which two are true？（）

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[多选] A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed. Which two are true？ （）

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[多选]
A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed.
Which two are true？（）