A vector is not changed if

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it is multiplied by an arbitrary scalar

it is slid parallel to itself.

it is rotated through an arbitrary angle

it is cross multiplied by a unit vector

answer is D.

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Detailed Solution

A vector has a direction and a magnitude. When a vector is rotated through a specific angle, its direction is also modified. A vector's magnitude changes when it is multiplied by a scalar quantity. If a vector is moved parallel to itself, nothing changes.

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