Close: Close is the exchange-designated period at the end of the trading session during which all transactions are considered made "at the close."
Range: Range is the difference between the high and low price of a commodity, futures, or option contract during a given period (trading session, week, month, year, etc).
Range: Range is the difference between the high and low price of a commodity, futures, or option contract during a given period (trading session, week, month, year, etc).
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.