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The temperature of two outer surface of a composite slab, consisting of two materials having coefficients of thermal conductivity $K$ and $2K$ and thickness $x$ and $4x$, respectively are $T_2$ and $T_1 (T_2> T_1)$. The rate of heat tranfer through the slab, in a steady state is $(\frac{A(T_2 - T_1) K}{x})f$, with $f$ equal to <br> <img src=" "/>

( A ) $1$
( B ) $1/2$
( C ) $1/3$
( D ) $2/3$

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