A service provider is planning the transition of a new, business-critical financial reporting service. According to ISO/IEC 20000-1, which activity is essential during the 'Service Design, Build and Transition' phase to minimize disruption to existing services?
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A
Developing a marketing plan to promote the new service to potential users.
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B
Ensuring the service is designed to be backward compatible with all legacy systems, regardless of cost.
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C
Conducting a post-implementation review six months after the service goes live.
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D
Defining and agreeing upon service acceptance criteria with the customer and other interested parties before deployment.