Is (1,1) a unit vector? Explain. Choose the correct answer below. O A. (1,1) is not a unit vector, since the sum of its components is not 1. OB. (1,1) is a unit vector, since its length is 1. OC. (1,1) is not a unit vector, since its length is not 1. OD. (1,1) is a unit vector, since each of its components has a magnitude of 1.

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