question_answer

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)            \[l=0,m=0\]