Find a formula for the nth term of the sequence. 0, 2 w / N 0 , 3 0 (alternating O's and W / N "'s ) 1 - (-1)n 1 + (-1)n+1 A) an B) an = 2 + (-1)n 2 - (-1)n+1 1 + (-1)n 1 + (-1)n+1 C) an D) an 2 + (-1)n 2 + (-1)n+1