Itr , help

Dear Friends/Experts,

Greetings of the Day !

If i have not filed my ITR of Assesment Year 2011-2012 (relevent Previous Year Becomes 2010-2011), and tax is PAYBLE on my Income. the lime limit 31-03-2012 is already over (period of non attracting panelty)

Now is the period which attracts panelty of rs 5,000 up to 31.03.2013 (i.e one year from the end of relevent assesment year).

Now can i file Retrun Electronically  or Physically? which one is a  valid way of filing returns and pay taxes?