Final answer:
The opacity system testing refers to the type of testing used to determine how well a system's internal workings are hidden from external users. It involves testing the system without knowledge of its internal structure (blackbox testing) or with knowledge of its internal structure (whitebox testing).
Step-by-step explanation:
The opacity system testing refers to the type of testing used to determine how well a system's internal workings are hidden from external users. It involves testing the system without knowledge of its internal structure (blackbox testing) or with knowledge of its internal structure (whitebox testing). Both blackbox testing and whitebox testing are methods used to assess the visibility of a system's internal operations. Therefore, the correct answer to the question is C.) Both of the Above.