Functional requirements can best be defined as:

• A. those processes that you want a system to perform.
• B. how the system behaves to achieve tasks.
• C. hardware requirements to function.
• D. the vendor support terms.

Answer: (B)

Functional requirements describe the specific actions, services, and behaviors the system must perform in order to support users and complete tasks. They capture what the software should do and how it should respond to inputs, producing the expected outputs. This makes the system’s behavior in carrying out its tasks a direct expression of functional requirements.

So, describing how the system behaves to achieve tasks aligns with defining the functions and capabilities the system must deliver. The other options focus on business processes, hardware infrastructure, or external terms, which are outside the scope of what the system must do.