d
(d) Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field.

\(M=\chi H\)

where, \(M\) is the magnetization of material, \(H\) is the magnetic field strength.

Therefore, \(\chi>0\)

Permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field.

\(B=\mu H\)

where, \(B\) is magnetic field, \(H\) is auxiliary magnetic field.

\(\mu>\mu_{0}\)

\(\mu_{r}=\frac{\mu}{\mu_{0}}>1\)