Consider applying the method of separation of variables with u (x,t) = X (x) T (t) to the partial differential equation: (∂2u/∂x2) + (∂u/∂x) = (∂u/∂t)  Which option gives the resulting pair of ordinary differential equations (where µ is a non-zero separation constant).  A. X" (x) + X' (x) = µ, T. (t) = µ B. X' (x) + X" (x) = µX (x), T.. (t) = µT (t)  C. X' (x) = µ, T.. (t) + T. (t) = µ D. X' (x) = µX (x), T.. (t) + T. (t) = µT (t)  E. X" (x) + X' (x) = µX (x), T. (t) = µT (t)

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