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Which of the following is a faulty S-AES step function?

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Which of the following is a faulty S-AES step function?

(a) Add round key

(b) Byte substitution

(c) Shift rows

(d) Mix Columns

I have been asked this question by my school teacher while I was bunking the class.

This key question is from The AES Algorthm topic in chapter Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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Right option is (b) Byte substitution

Easy explanation: The correct version in S-AES would be nibble substitution as 4 bits are taken at a time.

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