Which of the following is a form of functional testing?a) Security level testingb) Boundary value analysisc) Performance testingd) Usability testing

To determine which of the options is a form of functional testing, we need to understand what functional testing entails. Functional testing is a type of testing that focuses on verifying that the software or system being tested meets the specified functional requirements.

a) Security level testing: Security level testing is not directly related to functional testing. It focuses on assessing the security measures and vulnerabilities of a system.

b) Boundary value analysis: Boundary value analysis is a technique used in functional testing to test the behavior of a system at its boundaries or limits. It helps identify any issues that may occur when input values are at the edge of their valid ranges. Therefore, boundary value analysis is a form of functional testing.

c) Performance testing: Performance testing is not specifically focused on functional requirements. It aims to evaluate the performance characteristics of a system, such as response time, scalability, and resource usage.

d) Usability testing: Usability testing is also not directly related to functional testing. It focuses on assessing the ease of use and user-friendliness of a system.

Based on the above analysis, the correct answer is b) Boundary value analysis, as it is a form of functional testing.