The expression 1/√2 (i + j) is a  (A) unit vector  (B) null vector  (C) vector of magnitude  (D) scalar

The expression 1/√2 (i + j) is a  (A) unit vector  (B) null vector  (C) vector of magnitude  (D) scalar
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The expression 1/√2 (i + j) is a (A) unit vector (B) null vector (C) vector of magnitude √2 (D) scalar
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