If a secant segment and tangent segment are drawn to a circle from the same external point, the product of the length of the secant segment and its external part equals the square of the length of the tangent segment.

So,

XZ*YZ=WZ^2

4=WZ^2

WZ^2=4

WZ=4^{1/2}

WZ=2

ANSWER: D) 2

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