Which of the following electronic configuration is not possible according to Hund's rule ?

According to Hund's rule, electron first fill in unpaired form in vacant orbital and then fill in paired form to stabilize the molecule by which $1{\mathrm{s}}^2\mathrm{\hspace{0.17em}\hspace{0.17em}}2{\mathrm{s}}^2\mathrm{\hspace{0.17em}\hspace{0.17em}}2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\hspace{0.17em}}$ is not possible. According to Hund's rule, because $2{\mathrm{p}}_{\mathrm{x}},{\mathrm{p}}_{\mathrm{y}},{\mathrm{p}}_{\mathrm{z}}$ have the same energy level so electron first fills in unpaired form, not in paired form so it should be $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}_{\mathrm{x}}^{1}2{\mathrm{p}}_{\mathrm{y}}^1$