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What is the number of iterations required in total to generate all the sub-keys in blowfish?

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What is the number of iterations required in total to generate all the sub-keys in blowfish?

(a) 512

(b) 521

(c) 256

(d) 128

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This is a very interesting question from Blowfish Algorithm in division Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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Correct answer is (b) 521

Easy explanation: In total, 521 iterations are required to generate all required subkeys(i.e. 9 rounds for P1-P18 and 512 rounds for S1-S4).

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