Consider one-dimensional steady state heat conduction along $x$-axis ($0 \leq x \leq L$), through a planewall with the boundary surfaces ($x = 0$ and $x = L$) maintained at temperatures of $0^{\circ} C$ and $100^{\circ}C$. Heat is generated uniformly throughout the wall. Choose the $CORRECT$ statement.
- The direction of heat transfer will be from the surface at $100^{\circ}C$ to the surface at $0^{\circ} C$.
- The maximum temperature inside the wall must be greater than $100^{\circ} C$.
- The temperature distribution is linear within the wall.
- The temperature distribution is symmetric about the mid-plane of the wall.