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Which of the following is a valid disadvantage of the PRNG based on MAC function?

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Which of the following is a valid disadvantage of the PRNG based on MAC function?

(a) It has a high throughput

(b) It takes twice the execution time

(c) It is hardware intensive and can only work on high end processors

(d) none of the mentioned

The question was asked during an interview for a job.

Question is taken from CCM, GCM and Key Wrapping topic in section Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

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Correct answer is (b) It takes twice the execution time

For explanation: It takes twice the execution time, because HMAC involves two executions of the underlying hash function for each output block.

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