Let x(n) = x1(n) * x2(n), where x1(n) = (1/3)ⁿ u(n) and x2(n) = (1/5)ⁿ u(n).

A) x(n) = (1/15)ⁿ u(n)
B) x(n) = (1/8)ⁿ u(n)
C) x(n) = (1/15)ⁿ u(n)
D) x(n) = (1/2)ⁿ u(n)