A vector is not changed, if

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it is rotated through an arbitrary angle

it is multiplied by an arbitrary scalar

it is cross multiplied by a unit vector

it is displaced parallel to itself

answer is D.

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Detailed Solution

It is known that a vector will always remain in the unchanged position in case it is slid in parallel to the vector itself. This is happed because the direction or the magnitude of the vector in this situation will not change.

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