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How many DES encryptions take place in the ANSI X9.17 PRNG?

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How many DES encryptions take place in the ANSI X9.17 PRNG?

(a) 3

(b) 6

(c) 9

(d) 12

The question was posed to me in an interview.

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

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Best answer
The correct choice is (d) 12

Easiest explanation: Since there are 3 block, 12 DES encryptions take place.

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