Which of the Following Statements Is True

Which of the following statements is true?

A) WSDL definitions can use XML schemas to define the types used by WSDL input and output messages.
B) WSDL definitions can use XML schemas to define the types used by WSDL input and output operations.
C) WSDL definitions can use XML schemas to define the types used to establish the location used by service consumers to access the WSDL definitions.
D) WSDL definitions cannot be used in conjunction with XML schemas.