Service Composition A is comprised of 4 services. Service Composition B is comprised of 6 services. Because both service compositions are comprised of services from the same service inventory, the…

Question

Options

• A10
• B24
• CBased on the information provided, it's impossible to know how many services reside in the service
• DBased on the information provided, it's impossible to know how many services reside in the service

• A
  32% (11)
• B
  15% (5)
• C
  9% (3)
• D
  44% (15)

Explanation

Option D is correct because services within a shared inventory are designed to be reusable - the same service can participate in multiple compositions simultaneously. Since Composition A (4 services) and Composition B (6 services) both draw from the same inventory, an unknown number of those services may overlap, meaning the inventory total could be anywhere from 6 (maximum overlap) to 10 (zero overlap).

Why the distractors are wrong:

• A (10) incorrectly assumes zero shared services (4 + 6 = 10), ignoring the fundamental reuse principle of service inventories.
• B (24) appears to multiply 4 × 6, which has no logical basis in service composition concepts.
• C has identical text to D - this is likely a duplicate/typo in the question, making D the intended keyed answer.

Memory tip: Think of a service inventory like a library - two reading groups (compositions) can both check out the same book (service). Knowing each group has 4 and 6 books tells you nothing about how many unique books exist in the library without knowing which titles they share.

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