What is an inequality that can be written in any of the following forms: Ax + By < C, Ax + By > C, Ax + By ≤ C, or Ax + By ≥ C, where A, B, and C are real numbers and A and B are not both equal to zero?
A. Quadratic Equation
B. Linear Equation
C. Exponentional Equation
D. Linear Inequality