如图,已知△ACE≌△DFB,下列结论中正确结论的个数是( ) ①AC=DB; ②AB=DC; ③∠1=∠2; ④AE∥DF; ⑤S△ACE = S△DFB ; ⑥BC=AE; ⑦BF∥EC. A.4个 B.5个 C.6个 D.7个