Consider 4-bit gray code representation of numbers. Let h3 h2 h1 h0 be the gray code representation of a number n and g1g2g3g0 be the gray code representation of the number (n + 1) modulo 16. Which one of the following functions is correct?

• A. g0 (h3 h2 h1 h0) = Σ(1,2,3,6,10,13,14,15)
• B. g1 (h3 h2 h1 h0) = Σ(4,9,10,11,12,13,14,15)
• C. g2 (h3 h2 h1 h0) = Σ(2,4,5,6,7,12,13,15)
• D. g3 (h3 h2 h1 h0) = Σ(0,1,6,7,10,11,12,13)