Explanation
Quality function deployment (QFD) is a technique that involves translating customer needs or requirements into product features or specifications. QFD helps to relate the product features to customer value by using a matrix called a House of Quality, which shows how each feature satisfies a customer requirement, how important each requirement is to the customer, how well each feature performs compared to competitors, and how each feature affects other features. QFD can also help to identify gaps or opportunities for improvement in the product design. References: = PMI Professional in Business Analysis (PMI-PBA)
Examination
Content Outline (2019), page 12; Business Analysis for Practitioners: A Practice Guide (2015), page 69.

According to the PMI Guide to Business Analysis, user acceptance testing is a technique that involves verifying and validating that the solution meets the business requirements and satisfies the stakeholder needs and expectations. User acceptance testing is usually performed by the end users or their representatives, who evaluate the solution against predefined acceptance criteria and provide feedback on its functionality, usability, performance, quality, etc. User acceptance testing can help to determine whether a solution satisfies business requirements, as it can demonstrate that the solution delivers the intended business value and benefits, and that it meets or exceeds the stakeholder satisfaction. By reviewing the results of user acceptance testing, a business analyst can assess how well the solution meets business requirements, and identify any gaps or issues that need to be addressed or resolved. Evaluating the solution against the project charter, conducting a brainstorming session with end users, or reviewing the traceability matrix are other ways to analyze and validate requirements, but they do not necessarily determine whether a solution satisfies business requirements, as they do not involve testing or evaluating the solution in real or simulated conditions. References: PMI Guide to Business Analysis, page 317-318.

A closed-ended survey using the Likert scale is a type of survey that asks respondents to indicate their level of agreement or disagreement with a series of statements related to the current business process. This type of survey is useful for gathering data that can be used in a statistical analysis to measure user satisfaction, identify pain points, and evaluate the performance of the current business process. A closed-ended survey is also easier to administer and analyze than an open-ended survey, which requires more time and effort to code and interpret the responses. References: PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline1, page 17; Business Analysis for Practitioners: A Practice Guide2, page 91.