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Let S = ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ ≥ − − + − − − ∈ 0 2 | x | 1 | 3 x | : } 2 , 2 { ] 3 , 6 [ x and T = {x ∈ Z: x 2 – 7|x| + 9 ≤ 0}. Then the number of elements in S ∩ T is

1. 7
2. 5
3. 4
4. 3

Correct answer: 3

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