Question: 19) Which one is a valid covariance matrix a 0.1 0.3 0.1 0.3 0.2 -0.2 1-0.1 -0.2 0.3 a. ai b. b f0.1 0.3 0.1

19) Which one is a valid covariance matrix a 0.1 0.3 0.1 0.3 0.2 -0.2 1-0.1 -0.2 0.3 a. ai b. b f0.1 0.3 0.1 COS10 Doob banbrate 0.3 -0.2 -0.2 L0.1 -0.2 0.3 - C. 0.1 0 0 0 0 0.2 0 0 0.3) 50.1 0.3 0.1 d. 0 0.2 -0.2 0 0 0.3 of bobbet tet e. None of the above is a valid covariance matrix a

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