Given the following differential equation: (D² – 9) y = e-4= cos e* Using the method of variation of parameters, which of the following equations result after the proposed particular solution is substituted to the given differential equation? O A' (x) eš + B' (x) e-3ª = 0 3A' (x) e +3B' (2) e 3 = e 4x COs e O A' (x) cos 3x + B' (x) sin 3x =0 %3D -3A' (x) sin 3x + 3 B' (x) cos 3x COs e-* O A' (x) e3r + B' (x) e-3ª = 0 3A' (x) e3z – 3B' (x) e3ª = e¬4¤ cos e -3x %3D O A' (x) cos 3æ + B' (x) sin 3x = 0 3A' (x) sin 3x – 3 B' (x) cos 3x -4x Cos e

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