A given object taken n time more time to slide down `45^(@)` rough inclined plane as it taken to slide down a perfectly smooth `45^(@)` incline The coefficient of kintic friction between the object and the incline is .
A. `(1-(1)/(n^(2)))`
B. `(1)/(1-n^(2))`
C. `sqrt((1-(1)/(n^(2))))`
D. `sqrt((1)/(1-n^(2)))`