Which of the following is the correct representation of the electron dot structure of nitrogen $(N_2)$?

• A
  $\overset{\centerdot \centerdot }{:N} :: \overset{\centerdot \centerdot }{N:}$
• B
  $:N \vdots N:$
• C
  $\overset{\centerdot \centerdot }{:N} \vdots \overset{\centerdot \centerdot }{N:}$
• D
  $\overset{\centerdot }{:N} : : : \overset{\centerdot }{N:}$