Which of the following statements is true? Select the correct answer.

Question

Options

• AIndividual service contracts do not need to be published for SOAP-based Web services.
• BIndividual service contracts do not need to be published for REST services. Instead, they use a
• CComponents provide published contracts, but when building services as components,
• DNone of these statements are true.

• A
  2% (1)
• B
  93% (53)
• C
  2% (1)
• D
  4% (2)

Explanation

Option B is correct because REST services rely on a uniform contract - the standard HTTP methods (GET, POST, PUT, DELETE) - rather than individually published service contracts. This uniformity means clients can interact with any REST service using the same protocol conventions, eliminating the need for service-specific contract documents.

Why the distractors fail:

• A is the opposite of the truth: SOAP-based services do require published contracts in the form of WSDL (Web Services Description Language) documents, which explicitly define operations, message formats, and endpoints.
• C is a misleading half-statement; components built as services still follow the same service contract rules - the component/service distinction doesn't exempt anything from contract requirements.
• D fails because B is demonstrably correct.

Memory tip: Think "SOAP = contract on paper (WSDL), REST = contract by convention (HTTP verbs)." SOAP spells out every detail explicitly; REST trusts you already know the uniform language of the web.

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