The ratio of tensions on the tight side to slack side of multi-block brake is

(a) \((1-n \mu \tan \theta) /(1+n \mu \tan \theta)\)

(b) \((1+n \mu \tan \theta) /(1-n \mu \tan \theta)\)

(c) \([(1+\mu \tan \theta) /(1-\mu \tan \theta)]^{n}\)

(d) \([(1-\mu \tan \theta) /(1+\mu \tan \theta)]^{n}\).