If at each point of the curve y=x^3-a x^...

If at each point of the curve `y=x^3-a x^2+x+1,` the tangent is inclined at an acute angle with the positive direction of the x-axis, then (a)`a >0` (b) `a<-sqrt(3)` (c)`-sqrt(3)<=a<=` `sqrt(3)` (d) `non eoft h e s e`

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