A black box test is a dynamic analysis tool for testing software modules. During the testing of software modules a black box test works first in a cohesive manner as a single unit/entity consisting of numerous modules, and second with the user data that flows across software modules. In some cases, this even drives the software behavior. In choices B, C and D, the software (design or code) remains static and somebody closely examines it by applying his/her mind, without actually activating the software. Hence, these cannot be referred to as dynamic analysis tools.