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What do hidden lines in orthographic projections denote?

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What do hidden lines in orthographic projections denote?

(a) Holes or slots

(b) Change of Plane

(c) Position of cut

(d) Centre of a circle or cylinder

This question was addressed to me during a job interview.

The above asked question is from Different Types of Lines topic in portion Lines, Lettering and Dimensioning of Engineering Drawing

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Correct option is (a) Holes or slots

The best I can explain: Hidden lines denote those parts which cannot be seen when viewing the object. They are used when there are holes or slots in the object if they cannot be viewed directly. Change of plane is indicated by outlines. Position of cut is denoted by section line.

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