Who recognises the political parties in India?

Who is empowered to recognize various political parties in India as National or Regional Parties?

Which of the following political parties is not a national party as recognized by the Election Commission of India-

A political party is recognized as a regional party, if

A political party in India can be recognized as National Party if it has state party status in at least:

Which one of the following has been recognised as National Party in 2016?