From Kepler’s law of orbit, we can infer that the sun is located _____ of the planet’s orbit.

From Kepler’s law of orbit, we can infer that the sun is located _____ of the planet’s orbit.
 
(a) at the centre
 
(b) at one of the foci
 
(c) at both foci
 
(d) anywhere along the semi-minor axis
 
This question was posed to me by my college professor while I was bunking the class.
 
I’d like to ask this question from Gravitation topic in portion Gravitation of Physics – Class 11
Select the correct answer from above options 
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