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What is the number of satellites present in the Iridium system?

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What is the number of satellites present in the Iridium system?

(a) 72

(b) 51

(c) 66

(d) 32

I had been asked this question in final exam.

My query is from Satellite Applications topic in chapter Satellite Communication of Avionics

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Correct answer is (c) 66

Explanation: The satellite systems use low-earth-orbit satellites to perform the relay services to the main telephone system or to make a connection directly between any two cellular telephones using the system. One of the oldest and most widely used is the Iridium system. It uses a constellation of 66 satellites in six polar orbits with 11 satellites per orbit 420 mi above the earth.

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