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单项选择题

Which XSL if statement checks for the existence of a homepage attribute within an STS Universal User XML structure?()

A.<xsl:if test="//stsuuser:AttributeList/stsuuser:Attribute[attr='homepage']">
B.<xsl:if test="//stsuuser:AttributeList/stsuuser:Attribute[@name='homepage']">
C.<xsl:if-exists="//stsuuser:AttributeList/stsuuser:Attribute/custom:Homepage">
D.<xsl:if-exists="//stsuuser:AttributeList/stsuuser:Attribute[@name='homepage'])>