Though the PDEs
![1974_fe509066-caac-408d-98f3-58cd1f79bf3d.png](https://secure.tutorsglobe.com/CMSImages/1974_fe509066-caac-408d-98f3-58cd1f79bf3d.png)
are identical analytically, they differ when finite-differenced. If Euler explicit is used for the time derivative, and first-order backward differencing is used for the spatial derivative, which FDE will maintain the conservative property?