A diamond retailer is introducing a new stock taking system. Each diamond is assigned a character that represents the colour. The valid domain for the character ranges from D to Z. The colour is then graded using the following scale:
Which of the following test sets will provide the best equivalence partitioning coverage?
A. D, F, G, H, K, M, N, P, T, Z
B. D, G, K, N, S
C. A, E, H, L, P, T, Z
D. E, H, L, M, U,