Select the function that represents a geometric sequence.
o a. a(n) = (n - 1)(p. n)', where nis any real number
o b. a(n) = 1 + (1 - 1). p, where n is a positive integer
o c. a(n) = p(1+" - 1, where n is a positive integer
o d. a(n) = p + (n-1); • p, where n is a positive integer
cd