For the graph x = -3 find the slope of a line that is parallel to it. -3 -1/3 0 undefined

We have that

the slope of the line that is parallel to x=-3 is classified as undefined.

let's check the answer
1) take any two points of the line x = -3
point A (-3,0)   point B (-3,5)
2) find the slope of the line x=-3
m=(5-0)/(-3+3)=5/0> is undefined

the answer is the option undefined

He is right i did this thing before