If polygon MAST with coordinates M(-3,-1),A(-3,2),S(-1,3), and T(1,1) is reflected across x=-3, then which of the following coordinates represent vertices of the polygon M'A'S'T'? Select all that apply.
(-3,-1)
(-7,1)
(-3,2)
(1,1)
(-1,3)
(3,-1)
(-5,3)