What is the primary challenge of the Service characteristic of Abstraction?

What is the primary challenge of the Service characteristic of Abstraction?
A . Other elements of the architecture may be required to manage stateful information
B . The complexity grows as the number of services increases
C . Dependent services may not work as efficiently in a decoupled environment
D . If the service becomes too simplified, then it will become dependent on other services to be useful

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Answer: D