A:y=(x−4)2+4
B:y=(x−4)2−4
C:y=(x−8)2+4
D:y=(x−8)2−4
The director was fully convinced that this moving story, if ______ for television, would be a hit.
①A′,B,C,F′四点共面;
②EF'∥平面A′BC;
③若平面A′DE⊥平面BCDE,则CE⊥A′D;
④四棱锥A′﹣BCDE体积的最大值为 2 .
其中正确的是____(填上所有正确的序号).