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What is the reciprocal, of the length of radius of curvature?

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What is the reciprocal, of the length of radius of curvature?

(a) Focal length

(b) Curvature

(c) Optical centre

(d) Power

I have been asked this question by my school teacher while I was bunking the class.

My doubt is from Lenses topic in division Optics of Engineering Physics II

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Right option is (b) Curvature

For explanation: The reciprocal of length of radius of curvature is called curvature.

i.e.,   C=1/R

while, the reciprocal of focal length is power.

i.e., P=1/f

A lens has two centres of curvature, also it has two radii of curvature, one for each of the refracting surface.

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