Statement (A) : The electronic configuration of Beryllium is $1{\mathrm{s}}^{2}2{\mathrm{s}}^2$

Statement (B) : The electronic configuration of Carbon is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^2$

Statement (C): The electronic configuration of Nitrogen is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^4$