Find all x in R* that are mapped into the zero vector by the transformation xHAx for the given matrix A. 1 - 5 18 - 2 A= 0 1 - 5 3 - 12 39 ..... Select the correct choice below and fill in the answer box(es) to complete your choice. O A. There is only one vector, which is x= O B. X, +X2 +X4 O C. X3 O D. X3 + X4 2.

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A: The standard deviation is $40.

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