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How many marks are needed to mark a circular table into 180^o divisions using caliper principle?

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How many marks are needed to mark a circular table into 180^o divisions using caliper principle?

(a) 1

(b) 2

(c) 3

(d) 4

I got this question in an interview for job.

I would like to ask this question from Caliper Principle in chapter Angular Measurement and Circular Division of Engineering Metrology

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Correct choice is (d) 4

For explanation: 2 lines are marked at approx. 180° and individual microscopes set against these marks, let microscope A for mark 1 & B for 2. The position below B is noted & marked as 3. If the line division of 1 & 2 was exactly 180°, then the difference between 1 and 3 is the twice the error from 180° which can be measured. The space between 1 and 3 is divided by 4. Then 2 and 4 divide the circle into 180° divisions.

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