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What is the block size of blowfish block cipher?

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What is the block size of blowfish block cipher?

(a) 64 bits

(b) 128 bits

(c) 1043 bits

(d) 10 bits

I have been asked this question during an interview.

My question comes from Cryptography topic in chapter Number Theory and Cryptography of Discrete Mathematics

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Best answer
The correct option is (a) 64 bits

For explanation: Blowfish symmetric block cipher was created after DES but before AES. Its block size is 64 bits, and it can use key lengths from 32 up to 448 bits. It is a 16-round Feistel cipher and unlike in DES it’s S-boxes are key-dependent and so they are generated dynamically.

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