Which code fragment correctly describes an invoice?

Developers are creating a WSDL to describe an invoice in a Web service. Which code fragment correctly describes an invoice?
A. <Type name="Invoice">
<all>
<element name="id" type="string/>
<element name="name" type="string"/>
<element name="items">
<complexType>
<all>
<element name="item" type="tns:Item" minOccurs="0" maxOccurs="unbounded"/> </all>
</complexType>
</element>
</all>
</Type>
B. <complexType name="Invoice">
<all>
<element name="id" type="string/>
<element name="name" type="string"/>
<element name="items">
<complexType>
<all>
<element name="item" type="tns:Item" minOccurs="0" maxOccurs="unbounded"/> </all>
</complexType>
</element>
</all>
</complexType>
C. <types name="Invoice">
<all>
<element name="id" type="string/>
<element name="name" type="string"/>
<element name="items">
<complexType>
<all>
<element name="item" type="tns:Item" minOccurs="0" maxOccurs="unbounded"/> </all>
</complexType>
</element>
</all>
</types>
D. <complexType name="Invoice">
<all>
<element name="id" type="string/>
<element name="name" type="string"/>
<element name="items">
<type>
<all>
<element name="item" type="tns:Item" minOccurs="0" maxOccurs="unbounded"/> </all>
</type>
</element>
</all>
</complexType>

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