Which of the following are characteristics of a stationary process?

i) It crosses its mean value frequently


ii) It has constant mean and variance


iii) It contains no trend component


iv) It will be stationary in first difference form
(A)(ii) and (iv) only (B)(i) and (iii) only (C)(i), (ii), and (iii) only (D)(i), (ii), (iii), and (iv)
D