Which of the following is not a state function?

The minimum distance of a point on the curve $y = x^2 - 4$ from the origin is

$A$ variable circle passes through the fixed point $A(p, q)$ and touches the $x$-axis. The locus of the other end of the diameter through $A$ is

If $x$ is the specific conductance (in $S \ cm^{-1}$) of the electrolyte solution and $y$ is the molarity of the solution,then $\Lambda_m$ (in $S \ cm^2 \ mol^{-1}$) is given by:

Let $P(6, 3)$ be a point on the hyperbola $\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$. If the normal at point $P$ intersects the $x$-axis at $(9, 0)$,then the eccentricity of the hyperbola is:

Drift velocity ${v_d}$ varies with the intensity of the electric field $E$ as per the relation: