设随机变量X,Y独立同分布,且X的分布函数为F(x),则Z=max{X,Y}的分布函数为( ).
A、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/809c5b17-1b27-480f-bfae-f145621294c6.png" width="43" height="24">
B、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/cf66eeef-2b68-403a-896e-29ff3fd20449.png" width="69" height="21">
C、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/70a01d92-ea6d-4349-83ce-1c9bf846dcd2.png" width="89" height="24">
D、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/eb076c77-19c0-48e1-8757-874d59139154.png" width="127" height="21">
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