Under what condition does a straight line \[\frac{x-{{x}_{0}}}{l}=\]\[\frac{y-{{y}_{0}}}{m}=\frac{z-{{z}_{0}}}{n}\] is parallel to the xy-plane [AMU 2000]

Under what condition does a straight line \[\frac{x-{{x}_{0}}}{l}=\]\[

1.	Under what condition does a straight line \[\frac{x-{{x}_{0}}}{l}=\]\[\frac{y-{{y}_{0}}}{m}=\frac{z-{{z}_{0}}}{n}\] is parallel to the xy-plane [AMU 2000]
A.	\[l=0\]
B.	\[m=0\]
C.	\[n=0\]
D.	\[l=0,m=0\]
Answer» D. \[l=0,m=0\]

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Under what condition does a straight line \[\frac{x-{{x}_{0}}}{l}=\]\[\frac{y-{{y}_{0}}}{m}=\frac{z-{{z}_{0}}}{n}\] is parallel to the xy-plane [AMU 2000]

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