I general, for all the steady-state diffusion problems, the discretized equation can be given as aP P = anb nb-S. For a one-dimensional problem, which of these is wrong?

I general, for all the steady-state diffusion problems, the discretize

1.	I general, for all the steady-state diffusion problems, the discretized equation can be given as a_P _P = a_nb _nb-S. For a one-dimensional problem, which of these is wrong?
A.	a<sub>nb</sub> =a<sub>T</sub>+a<sub>B</sub>
B.	a<sub>nb</sub> =a<sub>S</sub>+ a<sub>N</sub>
C.	a<sub>nb</sub> =a<sub>W</sub>+a<sub>E</sub>
D.	a<sub>nb</sub> =a<sub>P</sub>+a<sub>E</sub>
Answer» E.