Which of the following statements are true? SELECT ALL THAT APPLY

Question

Options

• AA service can exist as a component.
• BA service can exist as a SOAP-based Web service.
• CA service can encapsulate one or more components.
• DA service can encapsulate one or more SOAP-based Web services.

• A
  93% (27)
• D
  7% (2)

Explanation

A is correct because a service can be physically realized as a software component - it's one of the valid implementation forms a service can take.

B is correct because SOAP-based Web services are a standard implementation technology for services in SOA; a service can be exposed via SOAP as its communication protocol.

C is correct because a core principle of service design is encapsulation - a single service can internally aggregate and hide multiple components behind a unified interface.

D is the distractor and is wrong because while a service can be a SOAP-based Web service (B), it does not encapsulate SOAP-based Web services. SOAP Web services exist at the same architectural layer as services - you don't nest them inside a service the way you do with components. Wrapping one service inside another would be orchestration or a composite pattern, not standard service encapsulation.

Memory tip: Think of it as two separate questions - "What form can a service take?" (component or SOAP web service → A and B) and "What can a service contain internally?" (components → C, but not other web services → D is false). The key asymmetry is that components live inside services; SOAP web services are how services present themselves to the outside world.

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