6. The LCM of ²1.0-1 and a +-2 will
be
A. (a + 1) (0-1) (-2) 1)
B. (a + b)(a - 1)(a + 2) + 1)
C. (a + 1) (0-1) (2) (-1)
D. (a? -a + 2)(a + b) (-1)​