With the historically rocky stock market months of September and October nearing, investors will likely be looking into exchange-traded-fund options to protect investments, Investor's Business Daily reports. As ETFs continue to gain in popularity, more options have been written on the funds.

ETF-options trading increased to 17% of the total options market in the first half of 2006, up from 3% in 2000, according to Options Clearing Corp. The top five ETF options comprised nearly 15% of the total.

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