The Hon.SC directed ECI to make necessary provision in Ballot paper/EVM for None of D Above Option So that the voters who do not wish to vote for any of the candidates can exercise their right not to vote for any candidate without violation of the secrecy of their decision.ECIs direction to implement to implement the NOTA option on EVM/Ballot paper.
http://eci.nic.in/eci_main/ElectoralLaws/OrdersNotifications/NOTA_11102013.pdf