What are the possible numbers of positive, negative, and complex zeros of f(x) = −x6 + x5 − x4 + 4x3 − 12x2 + 12? (6 points) Group of answer choices Positive: 3 or 1; negative: 3 or 1; complex: 4, 2, or 0 Positive: 5, 3, or 1; negative: 1; complex: 4, 2, or 0 Positive: 4, 2, or 0; negative: 2 or 0; complex: 6, 4, 2, or 0 Positive: 2 or 0; negative: 2 or 0; complex: 6, 4, or 2