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The Inverse S-box value for byte stored in cell (D,2)

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The Inverse S-box value for byte stored in cell (D,2)

(a) 0x5F

(b) 0x2D

(c) 0x7F

(d) 0x5D

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This interesting question is from Overview in division Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

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Right option is (c) 0x7F

Easy explanation: We first find the multiplicative inverse of 0xD2. And then perform the matrix transformation to get 0x7F.

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