The line lx+my+n=0 is a tangent to the c...

The line lx+my+n=0 is a tangent to the curve `y=x-x^2+x^3` , then

A

`lgt0,mgt0`

B

`llt0,mlt0`

C

`lmgt0`

D

`lmlt0`

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The correct Answer is:

D

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