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Which of the following auxiliary cathode is used for anodic protection?

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Which of the following auxiliary cathode is used for anodic protection?

(a) Graphite

(b) Platinized titanium

(c) Platinum-clad electrode

(d) Aluminum electrode

This question was addressed to me during a job interview.

My question is taken from Cathodic and Anodic Protection topic in section Corrosion Prevention of Corrosion Engineering

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The correct choice is (c) Platinum-clad electrode

The explanation: It is necessary to have an inert auxiliary cathode such as a platinum-clad electrode as the anode provides external electric current to passivates the metallic structure.

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