If laminar flow takes place in two pipes, having relative roughness of 0.002 and 0.003, at a Reynolds number of 1815, then
(a) the pipe of relative roughness of 0.003 has a higher friction factor
(b) the pipe of relative roughness of 0.003 has a lower friction factor
(c) both pipes have the same friction factor
(d) no comparison is possible due to inadequate data