The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium $= 99$)

• A
  $[Rn] 5f^{12} 6d^0 7s^2$
• B
  $[Rn] 5f^{11} 6d^0 7s^2$
• C
  $[Rn] 5f^{13} 6d^0 7s^2$
• D
  $[Rn] 5f^{10} 6d^0 7s^2$