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What is the basic principle by which laser gyros work?

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What is the basic principle by which laser gyros work?

(a) Coriolis effect

(b) Conservation of momentum

(c) Sagnac effect

(d) Mass conservation

I have been asked this question in homework.

My doubt stems from Gyroscopes topic in portion Satellite Radio Navigation  & Inertial Navigation of Avionics

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Right option is (c) Sagnac effect

Explanation: The Sagnac effect is a relativistic phenomena of light in a rotating reference system. When laser beams circulate in a closed path that is rotating in an inertial space, the optical length seen by the co-rotating beam appears longer than that seen by counter rotating beam.

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