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What is the diameter of silver electrodes in the amplifier circuit of Johnson et al?

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What is the diameter of silver electrodes in the amplifier circuit of Johnson et al?

(a) 2 mm

(b) 4 mm

(c) 6 mm

(d) 10 mm

The question was posed to me in exam.

Asked question is from Measurement of Respiration Rate in portion Patient Monitoring System of Biomedical Instrumentation

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Right answer is (c) 6 mm

The best I can explain: Johnson et al (1977) designed a miniature amplifier circuit fully encapsulated in epoxy resin with two small silver electrodes of 6 mm diameter, exposed flush with the base of the module. The electrode is attached to the skin using adhesive tape.

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