Does anyone know which one it is ?

Answer:
The slope of the line is undefined
Step-by-step explanation:
The given line is a vertical line.
The slope of any vertical line is undefined.
Let us see why by using the slope formula:
[tex]m = \frac{y_2-y_1}{x_2-x_1} [/tex]
We substitute the coordinates of the points to obtain:
[tex]m = \frac{3 - - 2}{1 - 1} = \frac{5}{0} [/tex]
This is not defined.