NSE Options. Explanation plz

When trading options on NSE, for Infosys, I see many options like
INFY APR 17 520CE
INFY APR 17 520PE
INFY APR 17 540CE
INFY APR 17 540PE
.
.
.
.
.INFY APR 17 740CE
INFY APR 17 740PE

what does this mean?

BTST: Buy infosys april 1000 PUT above rs 27, target at rs 32, SL @ rs 25

What does the last part of ths sentence mean?
Above rs 27, target @ rs 32, SL @ rs 25 ?

That is the option chain, which explains the moneyness of an option. Please do check this - http://zerodha.com/varsity/chapter/moneyness-of-an-option-contract/

I[quote=“Som_E, post:1, topic:12000”]
BTST: Buy infosys april 1000 PUT above rs 27, target at rs 32, SL @ rs 25
[/quote]

This looks like a typical message from tipster. He is asking you to buy the Put option at 27, for a price target of 32, and a stoploss of 25.