If \[lx+my+n=0\] is tangent to the parabola \[{{x}^{2}}=y\], then condition of tangency is [RPET 1999]

If \[lx+my+n=0\] is tangent to the parabola \[{{x}^{2}}=y\], then cond

1.	If \[lx+my+n=0\] is tangent to the parabola \[{{x}^{2}}=y\], then condition of tangency is [RPET 1999]
A.	\[{{l}^{2}}=2mn\]
B.	\[l=4{{m}^{2}}{{n}^{2}}\]
C.	\[{{m}^{2}}=4ln\]
D.	\[{{l}^{2}}=4mn\]
Answer» E.

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If \[lx+my+n=0\] is tangent to the parabola \[{{x}^{2}}=y\], then condition of tangency is [RPET 1999]

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