Which of the following matrices is a valid representation for a frame? Explain your answer. o v3% -1/2 3 [0.77 -0.64 0 3 3 0 3 B = 1 2 0.64 0.77 -1 ;C = 0.5 -1 0 0.5 A = 1/2 1 2 1/2 15 1 1

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