The key rule is that your scanned or electronic receipts must be as accurate as your paper records and you must be able to index, store, preserve, retrieve, and reproduce the records.

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Between its Exchange, and its new all-electronic market C2, CBOE captured 26.7% of all U.S. stock and stock-index options trades in April 2011.

FORBES: After Dropping NYSE Bid, Will Nasdaq Buy CBOE?