Triangle ABCABCABC has ∠BAC=120∘,BC=27,AB=AC+2.\angle BAC=120^\circ,\qquad BC=2\sqrt7,\qquad AB=AC+2.∠BAC=120∘,BC=27,AB=AC+2. What is the length of ABABAB? A222B444C666D272\sqrt727E1+131+\sqrt{13}1+13