With New York City on lockdown for Frankenstorm, the U.S. stock and options markets will be closed on Monday, and possibly Tuesday. The decision to just shutter shut the stock market followed a less drastic plan to open for business on Monday with limited staffing, with key employees booking hotel rooms and leaning on offices in other cities. Bond markets will remain open, but will close at noon, a trade group said. Nasdaq, the U.S. Securities and Exchange Commission will also be closed. Goldman Sachs Group Inc and Citigroup Inc. activated their emergency plans, which many firms put in place after the Sept. 11, 2001, attacks. It was not immediately clear if those plans had also changed.