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If the set ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ = ∈ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + − + − 3 z Re , C z : z 5 z 3 2 z z z z Re is equal to the interval ( α , β ], then 24( β – α ) is equal to-

1. 36
2. 27
3. 30
4. 42

Correct answer: 30

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