Assuming the tag library in the exhibit is imported with the prefix forum, which custom tag invocation produces a translation error in a JSP page?
<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd" version="2.0">
<tlib-version>1.0</tlib-version>
<short-name>forum</short-name>
<uri>http://example.com/tld/forum</uri>
<tag>
<name>message</name>
<tag-class>com.example.MessageTag</tag-class>
<body-content>scriptless</body-content>
<attribute>
<name>from</name>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>subject</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
A. <forum:message from="My Name" subject="My Subject" />
B. <forum:message subject="My Subject">
My message body.
</forum:message>
C. <forum:message from="My Name" subject="${param.subject}">
${param.body}
</forum:message>
D. <forum:message from="My Name" subject="My Subject">
<%= request.getParameter( "body" ) %>
</forum:message>
E. <forum:message from="My Name" subject="<%= request.getParameter( "subject" ) %>">
My message body.
</forum:message>
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