a) Product-oriented Approach – Focus on system (or software) quality
b) Process-oriented Approach – Focus on how NFRs can be used in the design process
c) Quantitative Approach – Find measurable scales for the functionality attributes
d) Qualitative Approach – Study various relationships between quality goals
Answer: c
Explanation: Quantitative Approaches in NFRs are used to find measurable scales for the quality attributes like efficiency, flexibility, integrity, usability etc.
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