Suppose we have run PCA on the database below. Which of the following would be a reasonable vector u(1) onto which to project the data? (By convention, u(1) should be a unit vector.) 3 2 хх XX Hi -3 -2 0X× 1 -1 xX -1 3 -2 -3 O a u(1) и(1) %3D [1/V2] u(1) l1/v2] [-1/v2] 1/V2 O d. u(1); %3D

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