A bus starts from rest and travels a distance \(s\) along a straight horizontal road. The coefficients of static and kinetic friction between the road and the tyres are \(\mu_s\) and \(\mu_k\), respectively. What is the minimum time \(t\) for the bus to travel this distance?
(a) \( t \propto \sqrt{\frac{s}{\mu_s}} \)
(b) \( t \propto \sqrt{\frac{s}{\mu_k}} \)
(c) \( t \propto \frac{s}{\mu_s} \)
(d) \( t \propto \frac{s}{\mu_k} \)
