C-03-Q071mediumsingle_mcqa2−6a+9=?a^2 - 6a + 9 = ?a2−6a+9=?a(a−3)2(a-3)^2(a−3)2b(a+3)2(a+3)^2(a+3)2c(a−3)(a+3)(a-3)(a+3)(a−3)(a+3)d(a−9)(a+1)(a-9)(a+1)(a−9)(a+1)