（2014）甲投资人同时买入一支股票的1份看涨期权和1份看跌期权，执行价格均为50元，到期日相同，看涨期权的价格为5元，看跌期权的价格为4元。如果不考虑期权费的时间价值，下列情形中能够给甲投资人带来净收益的有（ ）。
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