A developer has a requirement to expose a Web service interface to an existing order processing system. The order processing system is quite old and the company has doubts about its compatibility with newer technologies. What is the appropriate design?
A. only a new interaction layer
B. only a new processing layer
C. a new interaction layer and a new processing layer
D. a new interaction layer and a facade processing layer that uses the existing order processing system
E. a new processing layer and a facade interaction layer that uses the existing order processing system
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