What is the annual requirement for following manufacturer's test procedures?

• A. Optional
• B. Functional
• C. Non-functional
• D. Conditional

Answer: (B)

Verifying that the product performs its intended functions using the exact procedures provided by the manufacturer is about functional testing. The annual requirement implies a regular, mandatory check that the product still behaves as specified under normal conditions, which is what functional testing aims to confirm—that features work and meet stated requirements. The other options describe different ideas: optional would mean not mandatory, which conflicts with a yearly requirement; non-functional relates to performance, reliability, or quality attributes rather than core functions; and conditional would apply only under certain circumstances, whereas an annual requirement suggests a standing, unconditional practice. So, following the manufacturer's procedures each year best fits functional testing.