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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 >0` (b) `a<-sqrt(3)` `-sqrt(3)<=a<=` `sqrt(3)` (d) `non eoft h e s e`

A

`a gt 0`

B

`a le sqrt(3)`

C

`(-sqrt(3) lt a lt sqrt(3))`

D

`2 le a le 3 `

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The correct Answer is:
C
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