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How many internally common tangents can two circles have?

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How many internally common tangents can two circles have?

(a) 3

(b) 1

(c) 2

(d) 4

I had been asked this question in homework.

My question is taken from Drawing Tangents and Normals for Different Conditions of Circle in division Geometrical Construction of Engineering Drawing

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Right choice is (c) 2

For explanation: Two circles can have two internally touching common tangents. Both the tangents intersect at a point which is equidistant from the centers of both the circles. In other words, they intersect at a point which bisects the line joining the centers of the circles.

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