A.It would be best to hire someone to do the work. B.They should forget about the work. C.They should put it off till tomorrow. D.They should do the job together.
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【单选题】如图,已知△ABC中,AB=AC,∠BAC=90°,直角∠EPF的顶点P是BC的中点,两边PE、PF分别交AB、AC于点E、F,当∠EPF在△ABC内绕顶点P旋转时(点E不与A、B重合),给出以下五个结论:①AE=CF;②∠APE=∠CPF;③△EFP是等腰直角三角形;④EF=AP;⑤ S 四边形AEPF = 1 2 S △ABC . 其中正确结论的个数是( )