In the following partial differential equation, $\theta$ is a function of $t$ and $z$, and $D$ and $K$ are functions of $\theta$ $ D(\theta) \frac{\partial^{2} \theta}{\partial z^{2}}+\frac{\partial K(\theta)}{\partial z}-\frac{\partial \theta}{\partial t}=0$ The above equation is

(A) a second order linear equation

(B) a second degree linear equation

(C) a second order non-linear equation

(D) a second degree non-linear equation

In the following partial differential equation, $\theta$ is a function of $t$ and $z$, and $D$ and $K$ are functions of $\theta$ $ D(\theta) \frac{\partial^{2} \theta}{\partial z^{2}}+\frac{\partial K(\theta)}{\partial z}-\frac{\partial \theta}{\partial t}=0$ The above equation is

(A) a second order linear equation

(B) a second degree linear equation

(C) a second order non-linear equation

(D) a second degree non-linear equation

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