When a project requires a significant resource, such as the installation of a call center, it's important for the project manager to conduct an alternative analysis. This analysis will help determine the most effective and efficient approach, whether that's hiring people directly or contracting with a company. The decision should be based on various factors such as cost, time, quality, and the specific needs of the project. References:
Project Management Professional (PMP) Reference Materials, Professional in Business Analysis Reference Materials study guide. Please note that the exact documents and page numbers are not provided as the information is based on general project management principles. For more detailed information, please refer to the specific guides and documents mentioned.

A is the right answer as option B is not true because "Each level represents an increasing level of detail" does not contain the word descending for level! Refer PMBOK 5.3.3.1.