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Which of the following statements are not true about permanent magnets?

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Which of the following statements are not true about permanent magnets?

(a) They are simple

(b) They are inexpensive

(c) They don’t require shielding

(d) They don’t require power supply

This question was addressed to me in quiz.

My question is from Continuous Wave NMR Spectroscopy in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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Correct option is (c) They don’t require shielding

For explanation I would say: Permanent magnets are simple and inexpensive. But, permanent magnets require extensive shielding.

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