Included angle of V-belt is generally:

(a) \(10^{\circ}\) to \(20^{\circ}\)

(b) \(20^{\circ}\) to \(30^{\circ}\)

(c) \(30^{\circ}\) to \(40^{\circ}\)

(d) \(50^{\circ}\) to \(60^{\circ}\)