Match an expression for the apparent nth term of the sequence. (Assume n begins with 1) 1. 3, 7, 11, 15, 19, ... 2.1, 1/4,1/9,1/16,1/25,...3. 2/1,3/3,4/5,5/7,6/9,.. 4. 1/3,-2/9,4/27,-8/81,...A. an =n+1/2n-1 B. an= (-2)^n-1/3^n C. an = 4n -1 D. an = 1^2