Experts please help

The point ([p + 1], [p]) is lying inside the circle x2 + y2 – 2x – 15 = 0. Then the set of all values of p is (where [·] represents the greatest integer function).
(1) [–2, 3)
(2) (–2, 3)
(3) [–2, 0) ⋃ (0, 3)
(4) [0, 3)

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