下列关于期权合约说法正确的是( )
A.期权既选择权
B.期权的买方既可以行驶权利也可以放弃权力
C.期权的买入者以支付保证金的方式持有期权
D.期权的卖出方在买入者希望行使权力时必须履行义务
E.期权交易的双方权利和义务是不对称的
正确答案是ABCDE
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