Far expiry dates for options

Achilles edited May 1 in General
I fetched all the instruments using API, but there are some instruments which are confusing to me. For instance, I could see the BankNifty options with expiry dates of September 2024 and December 2024. Somehow there is no presence of October 2024 and November 2024. And other question is that why these options with these far expiries has been received if these are not being traded?

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