Which of the following statements about the K-maps is INCORRECT?

A. In K-maps, don't care terms are used only if they help in reducing the expression. Otherwise, they need not be considered

B. A two-variable K-map expression can have 4 possible combinations of the input variables

C. The binary number designations of the rows and columns of the K-map are in Gray code

D. The five-variable map may contain 2-squares, 4-squares, 8-squares, or other combinations involving four blocks of K-map having 16 squares each

Answer: Option D