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What is the parameter used to differentiate the overlay and underlay spectrum sharing technique?

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What is the parameter used to differentiate the overlay and underlay spectrum sharing technique?

(a) Delay in unlicensed spectrum

(b) Delay in licensed spectrum

(c) Degree of interference exhibited towards primary user

(d) Degree of interference exhibited towards secondary user

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Enquiry is from Next Generation Wireless Network topic in division Next Generation Wireless Network of Cognitive Radio

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Right choice is (c) Degree of interference exhibited towards primary user

To explain I would say: The overlay and underlay spectrum sharing techniques are classified based on the amount of interference directed towards the primary users while operating in the licensed spectrum band. Overlay exhibits zero interference while the underlay technique exhibits considerable interference which is regarded as noise by primary users.

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