Section: Volume A
Explanation:
Risk transfer means that impact of risk is reduced by transferring or otherwise sharing a portion of the risk with an external organization or another internal entity. Transfer of risk can occur in many forms but is most effective when dealing with financial risks. Insurance is one form of risk transfer. Hence when Harry hires a professional vendor to manage that risk, the risk event does not go away but the responsibility for the event is transferred to the vendor.
Incorrect Answers:
B: Risk acceptance means that no action is taken relative to a particular risk; loss is accepted if it occurs. Here Harry is not accepting this risk event; he does not want anyone of his team to become injured so he's transferring the event to professional vendor.
C: Mitigation are actions that Harry's project team could take to reduce the probability and/or impact of a risk event.
D: Avoidance removes the risk event entirely either by adding additional steps to avoid the event or reducing the project scope.

Section: Volume A
Explanation:
Decision tree analysis is a risk analysis tool that can help the project manager in determining the best risk response. The tool can be used to measure probability, impact, and risk exposure and how the selected risk response can affect the probability and/or impact of the selected risk event. It helps to form a balanced image of the risks and opportunities connected with each possible course of action. This makes them mostly useful for choosing between different strategies, projects, or investment opportunities particularly when the resources are limited. A decision tree is a decision support tool that uses a tree-like graph or model of decisions and their possible consequences, including chance event outcomes, resource costs, and utility.
Incorrect Answers:
A: Project network diagrams help the project manager and stakeholders visualize the flow of the project work, but they are not used as a part of risk response planning.
B: Cause-and-effect analysis is used for exposing risk factors and not an effective one in risk response planning.
This analysis involves the use of predictive or diagnostic analytical tool for exploring the root causes or factors that contribute to positive or negative effects or outcomes.
D: Delphi technique is used for risk analysis, i.e., for identifying the most probable risks. Delphi is a group of experts who used to rate independently the business risk of an organization. Each expert analyzes the risk independently and then prioritizes the risk, and the result is combined into a consensus.