In ARST, SU is the perpendicular bisector of RT and U lies on RT. Which statement(s) must be true? (I) ARST is equilateral. (II) ARSU = ATSU (III) SU is the bisector of 2 RST. (A) I only (D) II and III only (B) II only (E) I, II, and II (C) III only

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