Explanation
A change control process is a technique that helps to manage the changes to the requirements or the solution throughout the project lifecycle. A change control process defines the roles and responsibilities, the criteria and procedures, the tools and techniques, and the documentation and communication for handling the changes.
A change control process helps to ensure that the changes are properly identified, analyzed, approved, implemented, verified, and tracked. A change control process can help the BA to keep this situation from occurring in the future by creating a clear and consistent mechanism for managing the changes and avoiding any unauthorized or uncontrolled changes that may affect the quality or scope of the solution. A risk strategy is a technique that helps to identify, analyze, and manage the uncertainties and threats that may affect the project or the solution. A risk strategy defines the risk appetite, tolerance, and thresholds, the risk identification and assessment methods, the risk response and monitoring plans, and the risk roles and responsibilities. A risk strategy can help the BA to mitigate the potential impacts of the changes, but it does not prevent the changes from occurring. A prioritization approach is a technique that helps to rank the requirements or solution options based on their relative importance, urgency, value, or dependency. A prioritization approach defines the criteria and methods, the tools and techniques, and the roles and responsibilities for prioritizing the requirements or solution options. A prioritization approach can help the BA to determine the optimal scope and sequence of the solution delivery, but it does not control the changes to the requirements or solution options. A stakeholder engagement plan is a technique that helps to plan and manage the interactions and communications with the stakeholders throughout the project. A stakeholder engagement plan defines the stakeholder identification and analysis, the stakeholder communication and collaboration methods, the stakeholder feedback and approval mechanisms, and the stakeholder roles and responsibilities. A stakeholder engagement plan can help the BA to ensure that the stakeholders are informed, engaged, and satisfied with the project progress and outcomes, but it does not regulate the changes requested by the stakeholders.
References: BABOK Guide v3, Chapter 10: Techniques, Section 10.11: Change Control Process, p. 510-512; Section
10.51: Risk Analysis and Management, p. 567-569; Section 10.38: Prioritization, p. 550-552; Section 10.24:
Focus Groups, p. 532-533.

Explanation
Categorizing and ranking requirements is a technique of prioritizing requirements based on multiple criteria and dimensions. Categorizing requirements by type of work can help to group the requirements that have similar characteristics, such as functional, non-functional, technical, or business requirements. Ranking requirements within each category by ease of implementation to difficulty of implementation can help to determine the effort, time, and resources needed to implement the requirements, as well as the potential risks and dependencies. This approach can help Zoe to plan the solution delivery and to balance the scope, quality, cost, and schedule of the project. References: BABOK Guide v3, page 52; CBAP / CCBA Certified Business Analysis Study Guide, page 160.