单选题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？（）Ajsp：declarationint count = 0；jsp：declarationB%! int count = 0； %Cjsp：declaration.instanceint count = 0；. jsp：declaration.instanceDjsp：scriptlet.declarationint count = 0；. jsp：scriptlet.declaration
单选题
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>
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