Which of the below is not correct? A) A solution to the "diet" problem has to be physically feasible, that is, a negative amount" of a foodstuff is not accepted B)The diet construction problem leads to a linear system since the amount of nutrients supplied by each ingredient is a multiple of a vector C)Kirchhoff's voltage law states that the sum of voltage drops in one direction around a loop equals the sum of voltage sources in the same direction D)The model for current flow is linear because both Ohm's law and Kirchhoffs law are linear E) If a solution to a linear system for the current flow gives a negative current, then the solution is not physically feasible.