A new project's goal is to replace an existing system. What is an input into solution evaluation and decision making in this context?

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 business analyst conducts an initial review to define scope. The analysis includes the review of the business case, project goals, and objectives to obtain the necessary and required context Based on that information, the business analyst determines that this is a large project with multiple interfaces which could cost the company money that was not initially included in the budget.
What characteristics of the project are needed to determine the approach so that the business analyst can validate whether they will need to have a discussion about the budget?

A company is awarded a contract to design and build a custom product. The contract references a detailed technical specification.
What is the best action to take to ensure the design meets customer requirements?

During the project execution phase, the client requests the addition of a new feature. Which of the following would allow the business analyst to determine the impact for the specific requirement change?