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

Question

Options

• AService agents are event-driven programs that always have published WSDL definitions.
• BService agents are event-driven programs that are automatically invoked to perform intermediary
• CService agents are event-driven programs that are used only with asynchronous MEPs.
• DService agents are not event-driven programs.

• A
  2% (1)
• B
  87% (41)
• C
  9% (4)
• D
  2% (1)

Explanation

Option B is correct because service agents are event-driven middleware components that activate automatically in response to messages or events, performing intermediary processing tasks (such as routing, transformation, or logging) between a service consumer and provider - without requiring direct invocation.

Why the distractors fail:

• A is wrong because service agents do not require published WSDL definitions; they operate behind the scenes and are not necessarily exposed as public service contracts.
• C is wrong because service agents are not restricted to asynchronous MEPs (Message Exchange Patterns); they can participate in synchronous exchanges as well.
• D is wrong because event-driven behavior is actually a defining characteristic of service agents - they are triggered by events or messages, not called explicitly like a typical function.

Memory tip: Think of a service agent as an automatic middleman - it "wakes up" when something happens (event-driven) and does work in between two parties (intermediary). The word "agent" implies autonomy and automatic action, which rules out D, and "intermediary" is the key differentiator that makes B the precise answer.

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