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What is the Discrete logarithm to the base 15 (mod 19) for a =9?

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What is the Discrete logarithm to the base 15 (mod 19) for a =9?

(a) 3

(b) 7

(c) 12

(d) 4

The question was posed to me in an internship interview.

I need to ask this question from Number Theory in chapter More Number Theory of Cryptograph & Network Security

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The correct answer is (d) 4

To elaborate: log_15(9) mod 19 = 4.

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