The partial differential equation \(\frac{{\partial u}}{{\partial t}} + u\frac{{\partial u}}{{\partial x}} = \frac{{{\partial ^2}u}}{{\partial {x^2}}}\) is a

• A. Linear equation of order 2
• B. Non-linear equation of order 1
• C. Linear equation of order 1
• D. Non-linear equation of order 2