Given:
Line is x=0
We have to find the equation of line that is parallel to x=0
Now,
Any line parallel to x=0 will be having the equation of the form x=constant.
Hence,
line y=x-4 is not parallel to x=0
line x=3y is not parallel to x=0
line y=6 is not parallel to x=0
line x=2 is parallel to x=0
Therefore,
x=2 is the equation of line which is parallel to x=0
Option (4) is correct.