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covariance matrix of the vector z =[z1 z2) b. What is the mean (expectation) of y = e theta z where e(theta) is a complex exponential with a constant deterministic angle (theta) In part (b), you calculated E(y). Which one of the following is correct:C. \text { i. } E(y)=e^{j \theta} E(z) \text { ii. } E(y) \neq e^{j \theta} E(z) In part (c), if the correct answer is (i) then the vector z is called circular symmetric vector. If the correct answer is (ii) then the vector z is not circular symmetric vector. Read through the Appendix A to learn more about this statement.

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