Which one of the following species is paramagnetic in nature?

The number of unpaired electrons and electronic configuration of the given species is shown below - $\mathrm{V}^{4+}[\mathrm{Z}=23]=[\mathrm{Ar}]_{18} 3 \mathrm{~d}^1$ No. of unpaired electron $=1$ - $\mathrm{Sc}^{3+}[\mathrm{Z}=2 \mathrm{l}]=[\mathrm{Ar}]_{18} 3 \mathrm{~d}^0$ No. of unpaired electron $=0$ - $\mathrm{V}^{5+}[\mathrm{Z}=23]=[\mathrm{Ar}]_{18} 3 \mathrm{~d}^0$ No. of unpaired electron $=0$ - $\mathrm{Zn}^{2+}[\mathrm{Z}=30]=[\mathrm{Ar}]_{18} 3 \mathrm{~d}^{10}$ Number of unpaired electron $=0$ $\therefore$ The correct option among the following is (4).