Explanation/Reference:
Explanation:
According to the twenty- eight stakeholders. Communication channels are paths of communication with stakeholders in a project. The number of communication channels shows the complexity of a project's communication and can be derived through the formula shown below:
Total Number of Communication Channels = n (n-1)/2
where n is the number of stakeholders.
Hence, a project having five stakeholders will have ten communication channels. Putting the value of the number of stakeholders in the formula will provide the number of communication channels. Putting the value of the number of stakeholders in the formula will provide the number of communication channels:
Number of communication channel = (n (n-1)) / 2
= (28 (28-1)) / 2
= (28 x 27) / 2
= 756 / 2
= 378

Explanation/Reference:
Explanation:
The activity cost estimates review is valuable in identifying risks as it provides a quantitative assessment of the expected cost to complete the scheduled activities and is expressed as a range, with a width of the range indicating the degrees of risk.
Incorrect Answers:
A: The activity duration estimates review is valuable in identifying risks associated to the time allowances for the activities or projects as a whole, with a width of the range indicating the degrees of risk.
B: This is the output of plan risk management process. A Risk management plan is a document arranged by a project manager to estimate the effectiveness, predict risks, and build response plans to mitigate them. It also consists of the risk assessment matrix.
C: The cost management plan sets how the costs on a project are managed during the project's lifecycle. It defines the format and principles by which the project costs are measured, reported, and controlled. The cost management plan identifies the person responsible for managing costs, those who have the authority to approve changes to the project or its budget, and how cost performance is quantitatively calculated and reported upon.