The design of horizontal transition curve length for highways should take into account -

three factors namely, allowable values of rate of change of centrifugal acceleration and superelevation and the minimum length formula given by the IRC.

two factors, namely, comfort and rate of change of superelevation.

two factors, namely, rate of change of superelevation and minimum length formula given by the IRC.

only one factor, namely, the rate of change of centrifugal acceleration.