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

Who recognises the political parties in India?

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:

To be recognized as National Party in India, a party must have secured at least how much percentage of votes in the previous election?