Compute fall time for a two-input NOR gate with 6/2 pulldown and 12/2 pullup that drives these wires (assume that the wire impedance is modeled as a single lump):
a) Poly wire of width 2λ, length 1,000λ.
b) Metal 1 wire of width 3λ, length 1,000λ.
c) Metal 1 wire of width 3λ, length 10,000λ.