The sum of an infinite geometric series is 2 and the sum of the geometric series made from the cubes of this infinite series is 24. Then the series is:
a. 3, 2/3, -3/4,3/8 ....
b. 3, 3/2, 2/4,3/8 ....
c. 3, -3/2, 3/4,-3/8 ....
d. 1, -1/2, 1/4,-1/8 ....