问题：

[多选]

Click the Exhibit button.

The h：highlight tag renders its body， highlighting an arbitrary number of words， each of which is passed asan attribute （word1， word2， ...）. For example， a JSP page can invoke theh：highlight tag as follows：

11. <h：highlight color="yellow" word1="high" word2="low">

12. high medium low

13. </h：highlight>
Given that HighlightTag extends SimpleTagSupport，which three steps are necessary to implement the taghandler for the highlight tag？（）

A . Add a doTag method
B . Add a doStartTag method
C . Add a getter and setter for the color attribute
D . Create and implement a TagExtraInfo class
E . Implement the DynamicAttributes interface
F . Add a getter and setter for the word1 and word2 attribute