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

• A. ∑anb =aT+aB
• B. ∑anb =aS+ aN
• C. ∑anb =aW+aE
• D. ∑anb =aP+aE