Question 2: [20 Marks] Boolean Function Simplification using K-map Substitution boxes (S-Boxes) are components of some popular symmetric encryption methods to provide confusion between input and output data. The following table shows one S-box of the Serpent 1 encryption algorithm, which is a 4-bit-to-4-bit binary mapping function. For B3,B2,B1 and B0 respectively, construct and cluster the K-maps and write down their simplified SOP expressions