The point `( [P + 1] , [P] )` (where [.] denotes the greatest integer function), lyinginside the region bounded by the circle `x^2 + y^2 - 2x - 15 = 0 and x^2 + y^2 - 2x - 7 =0,` then :
A. ` a in [-1, 0] uu (0,1)uu[1,2]`
B. ` a in [-1, 2]-{0,1}`
C. `a in (-1, 2)`
D. none of these
