If the coefficients of x² and x³ are both zero, in the expansion of the expression (1 + ax + bx²) (1 – 3x)ᵗ⁵ in powers of x, then the ordered pair (a, b) is equal to
(A) (–54, 315) (B) (28, 861)
(C) (28, 315) (D) (–21, 714)
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