Assuming the tag library in the exhibit is imported with the prefix stock, which custom tag invocation outputs the contents of the variable exposed by the quote tag?
<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sum.com/xml/ns/j2ee"
xmln:schemaLocation="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sum.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd" version="2.0">
<tlib-version>1.0</tlib-version>
<short-name>stock</short-name>
<uri>http://example.com/tld/stock</uri>
<tag>
<name>quote</name>
<tag-class>com.example.QuoteTag</tag-class>
<body-context>empty</body-context>
<variable>
<name-from-attribute>var</name-from-attribute>
<scope>AT_BEGIN</scope>
</variable>
<attribute>
<name>symbol</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>var</name>
<required>true</required>
<rtexprvalue>falsh</rtexprvalue>
</attribute>
</tag>
</taglib>
A. <stock:quote symbol="SUNW" />
${var}
B. ${var}
<stock:quote symbol="SUNW" />
C. <stock:quote symbol="SUNW">
${var}
</stock:quote>
D. <stock:quote symbol="SUNW" var="quote" />
${quote}
E. <stock:quote symbol="SUNW" var="quote">
<%= quote %>
</stock:quote>
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