Which of the Following Statements Is True

Which of the following statements is true?

A) For a service consumer to interact with a service it must comply to the requirements of the service contract.
B) The service contract is used to express meta data about a service for human consumption only, and compliance to the service contract by service consumers is therefore not required.
C) Service contracts are only used to access a service when the service consumer itself is not a service.
D) All of these statements are true.