6 Consider the following graph of the polynomial P(x), which is of unknown degree. d out of 12 - -2 3 -1 in to we do The polynomial can be factored to obtain P(x) = a(x - b)(x+ 1)(x - 2). What are possible values of a, b, c and d? Select one: O a. a=-2, b=-1, c=2, d=3 O b. a=2, b=1, c=2, d=3 O c. a=-2, b=1, c=4, d=3 O d. a=-2, b=1, c=2, d=2