What is the dimensional formula of an electron volt $(eV)$, and what is its value in Joules $(J)$?

• A
  $[ML^2T^{-2}]$ and $1.6 \times 10^{-19} \ J$
• B
  $[MLT^{-2}]$ and $1.6 \times 10^{-19} \ J$
• C
  $[ML^2T^{-1}]$ and $1.6 \times 10^{-19} \ J$
• D
  $[ML^2T^{-2}]$ and $1.6 \times 10^{-20} \ J$