Which of the following sequences is geometric?
1,4,9,161, 4, 9, 161,4,9,16
3,6,12,243, 6, 12, 243,6,12,24
1,2,4,71, 2, 4, 71,2,4,7
1,−1,1,−11, -1, 1, -11,−1,1,−1