If Service B is invoked by Service A and then Service B invokes Service C and all of this happens as part of the same service activity, then Service B would be considered: Select the correct answer.

Question

Options

• Aan intermediary
• Ba service agent
• Can ultimate receiver
• Dan initial sender

• A
  86% (38)
• B
  2% (1)
• C
  7% (3)
• D
  5% (2)

Explanation

Service B is an intermediary because it occupies a middle position in the message chain - it receives a request from Service A and passes a new invocation to Service C, processing the message without being either the origin or the final destination. Option B (service agent) is wrong because a service agent acts autonomously on behalf of another party, which is a different role unrelated to position in a call chain. Option C (ultimate receiver) is wrong because that role belongs to Service C, the endpoint that actually fulfills the request and sends no further invocations. Option D (initial sender) is wrong because Service A holds that role as the originator of the activity.

Memory tip: Think of the word "intermediary" literally - it's in the middle. If a service both receives and sends within the same activity, it's the intermediary sitting between the initial sender (first caller) and the ultimate receiver (last callee).

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