What is the thermal resistance of the plate?

Question

A metal plate has surface area of 2 m², thickness 10 mm and a thermal conductivity of 200 W/mK. What is the thermal resistance of the plate? (IES-06)

(a) 4 x 10^-4K/W          (b) 2.5 x 10^-3 K/W

(c) 1.5 x 10^-5 K/W       (d) 2.5 x 10^-5 K/W