Difference between a user requirement and a design constraint?

Difference between a user requirement and a design constraint?

• A. A user requirement is what the user needs the product to do; a design constraint is a limit (cost, size, materials, manufacturing capability) that must be followed.
• B. A design constraint is what the user needs the product to do; a user requirement is a limit.
• C. They are the same thing and interchangeable.
• D. A user requirement is about aesthetics; a design constraint is about packaging.

Answer: (D)