Consider the processes (Yₜ = 0.3Yₜ₋₁ + eₜ) and (Wₜ = (1 - B)Yₜ). Which of the following statements is true?
a) Only (Yₜ) is stationary.
b) Only (Wₜ) is stationary.
c) Both (Yₜ) and (Wₜ) are stationary.
d) Neither (Yₜ) nor (Wₜ) are stationary.