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jsp:useBean doubt

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A JSP page has the following useBean declaration that references a bean called Person. The person class has a private field called firstname and an appropriate getter (accessor) method for retrieving the value of that field.

<jsp:useBean id="person" type="com.examulator.Person" class="com.examulator.Person" scope="session" />

Which of the following is the correct syntax for a getProperty tag to retrieve the value of the instance of Person.

<jsp:getProperty name="person" property="firstname"/>

<jsp:getProperty name="person" property="getFirstname"/>

<jsp:getProperty id="person" property="firstname"/>

<jsp:getProperty name="person" property="firstname" class="com.examulator.Person"/>

<jsp:getProperty name="person" property="firstname" scope="session"/>

According to me the answer is 'e' as the getProperty gets it from the scope session but the answer given is 'a',can anybody let me know which one is correct.
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jsp:getProperty does not have an attribute scope. Only useBean has scope.
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