(1 point) The left end of a rod of length L is held at temperature 0, and the right end is insulated. The initial temperature is f(x) throughout. Choose the PDE and boundary/initial conditions that model this scenario. Partial Differential Equation au A. K 0 0 ax2 at au au B. + 0, 0 0 ar2 at2' C. a? Boundary/Initial Conditions O au u(0,t) = 0 = 0, t> 0 ar A. u(x,0) = f(x), 0 0 u(L,t) = 0, = 0, at It=0 u(x,0) = f(x), C. 0