Click the Exhibit button. Assuming the tag library in the exhibit is imported with the prefix stock，which custom tag invocation outputsthe contents of the variable exposed by the quote tag？（）

• A、<；stock：quote&ensp；symbol="；SUNW"；&ensp；/>；${var}
• B、${var}.&ensp；<；stock：quote&ensp；symbol="；SUNW"；&ensp；/>；
• C、<；stock：quote&ensp；symbol="；SUNW"；>；.&ensp；${var}.&ensp；<；/stock：quote>；
• D、<；stock：quote&ensp；symbol="；SUNW"；&ensp；var="；quote"；&ensp；/>；${quote}