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In Atomic Absorption Spectroscopy, with what material is the cathode in Hollow cathode lamp constructed?

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In Atomic Absorption Spectroscopy, with what material is the cathode in Hollow cathode lamp constructed?

(a) Tungsten

(b) Quartz

(c) Element to be investigated

(d) Aluminium

I got this question in an interview for internship.

I want to ask this question from Atomic Absorption Spectroscopy in portion Colorimetry and Spectrometry of Analytical Instrumentation

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Right answer is (c) Element to be investigated

Easy explanation: The cathode in Hollow cathode lamp is constructed of the element to be investigated. The anode is made of tungsten.

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