Equation of a line through (a, b, c) and parallel to z-axis is

• A

  $\frac{x-a}{1}=\frac{y-b}{0}=\frac{z-c}{0}$

• B

  $\frac{x-a}{0}=\frac{y-b}{0}=\frac{z-c}{1}$

• C

  $\frac{x-a}{1}=\frac{y-b}{1}=\frac{z-c}{1}$

• D

  $\frac{x-a}{0}=\frac{y-b}{1}=\frac{z-c}{0}$