Which of the following tools or lechniques can help to identify the high-priority changes needed to improve that service?

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Last year, a company registered a high number of complaints about its customer service.

Which of the following tools or lechniques can help to identify the high-priority changes needed to improve that service?
A . A cause-and-effect diagram
B . A flowchart of the service
C . A work breakdown structure analysis of the service
D . A Pareto analysis

Answer: D