Select the function that represents an arithmetic sequence.a.a(n) = p(1 + i)n – 1, where n is a positive integerb.a(n) = p + (n – 1)i • p, where n is any real numberc.a(n) = p + (n – 1)i • p, where n is a positive integerd.a(n) = p(1 + i)n – 1, where n is any real number

Because n must be a positive integer we can eliminate b and d. Assume i=√-1.
Of the two remaining options, c has the correct format for an AP with constant difference ip.