For manageability purposes， you have been told to add a "count" instance variable to a critical JSP Document so that a JMX MBean can track how frequent this JSP is being invoked. Which JSP code snippetmust you use to declare this instance variable in the JSP Document？（）

• A、<jsp：declaration>int count = 0；<jsp：declaration>
• B、<%! int count = 0； %>
• C、<jsp：declaration.instance>int count = 0；. <jsp：declaration.instance>
• D、<jsp：scriptlet.declaration>int count = 0；. <jsp：scriptlet.declaration>