A student claims that the line x = -2 is a function because it can be written in the form 'x = constant,' which is similar to 'y = constant.' Evaluate this claim and provide the correct classification with justification.

The claim is incorrect; x = -2 is not a function because it has no x-intercept.

The claim is correct; x = -2 is a function because it passes the horizontal line test.

The claim is correct; x = -2 is a function because it is a linear equation that can be plotted on a coordinate plane.

The claim is incorrect; x = -2 is not a function because a single input (x = -2) is associated with infinitely many different outputs (y).