单选题下列对custom tags的论述哪个不正确（）A是开发者自己定义的tag，可以在JSP页面中使用BJSP中定制标记符，实质上就是以标记的形式封装了一个俱有独立功能的Java类C必须依靠TLD文件实现custom tag到实现类的映射D是某些厂商自己实现的JSP扩展
单选题
下列对custom tags的论述哪个不正确（）
A
是开发者自己定义的tag，可以在JSP页面中使用
B
JSP中定制标记符，实质上就是以标记的形式封装了一个俱有独立功能的Java类
C
必须依靠TLD文件实现custom tag到实现类的映射
D
是某些厂商自己实现的JSP扩展
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