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How many internal tangents are there for two circles?

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How many internal tangents are there for two circles?

(a) 4

(b) 3

(c) 2

(d) 1

The question was posed to me in an international level competition.

My question comes from Drawing Tangents and Normals for Different Conditions of Circle topic in portion Geometrical Construction of Engineering Drawing

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Best answer
The correct answer is (c) 2

The best explanation: Internal tangents are those which touch both the circle and also intersect each other on the line joining the centers of circles. And the internal tangents intersect each other at midpoint of line joining the center of circles only if circles have the same diameter.

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