Which of the following statements is true?

Question

Options

• AThe application of the Legacy Wrapper pattern results in the coupling of the service consumer to
• BThe application of the Legacy Wrapper pattern results in the coupling of the service contract to the
• CThe application of the Legacy Wrapper pattern supports the Contract Centralization pattern by
• DNone of these statements are true.

• A
  3% (1)
• B
  12% (4)
• C
  82% (27)
• D
  3% (1)

Explanation

Option C is correct because the Legacy Wrapper pattern encapsulates a legacy system behind a clean, standardized service contract, creating a single centralized access point. This directly supports the Contract Centralization pattern, which requires that consumers interact with a unified contract rather than directly with backend system internals.

Why the distractors fail:

• Option A is wrong because the Legacy Wrapper decouples the consumer from the legacy system - consumers only see the wrapper's contract, not the legacy internals.
• Option B is wrong because the wrapper's service contract is intentionally designed independently of the legacy system's API; the wrapper handles the translation internally, so no coupling exists at the contract level.
• Option D falls away once you recognize C is valid.

Memory tip: Think of the Legacy Wrapper as a "clean facade over a messy room." The facade (centralized contract) is what visitors see - supporting Contract Centralization - while the clutter (legacy logic) stays hidden behind it. If any option says the pattern couples something, it's almost certainly wrong, since decoupling is the pattern's core purpose.

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