To qualify as a service composition, at least __________ participating services need to be present. Otherwise, the service interaction only represents a point-to-point exchange.

Question

Options

• Atwo
• Bfour
• Csix
• Deight

• A
  88% (38)
• B
  7% (3)
• C
  2% (1)
• D
  2% (1)

Explanation

Option A (two) is correct because a service composition requires a minimum of two participating services - a requestor and at least one composed service - creating an orchestrated or choreographed interaction beyond a simple direct call. Options B, C, and D (four, six, eight) are all distractors that inflate the threshold; there is no technical or architectural requirement for these higher numbers, and choosing them reflects a misunderstanding of what "composition" means in service-oriented architecture. A point-to-point exchange involves exactly one service calling another without any composition layer, so the moment you add even one additional service into a coordinated interaction, you cross into composition territory. Memory tip: Think of "composition" like a musical duet - the minimum number of performers to have a composition is two; a single performer is just a solo (point-to-point).

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