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Which among the following is not a challenge for spectrum sensing?

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Which among the following is not a challenge for spectrum sensing?

(a) Continuous sensing of spectrum

(b) Energy consumption

(c) Switching between sensing and transmission

(d) Limit sensing when a single radio is deployed

I had been asked this question in an interview.

Question is from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio

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The correct answer is (d) Limit sensing when a single radio is deployed

The best I can explain: Radio cannot sense the entire available spectrum continuously. An upper limit is established on energy consumption for a period of time. Thus accurate spectrum knowledge is unavailable at all times. Cross-layer interaction is required for switching between transmissions and sensing operations during in-band sensing operation.

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