A body is allowed to slide down a frictionless track freely under gravity. The track ends in a semicircular shaped part of diameter D. What should be the height minimum from which the body must fall so that it completes the circle:

$$\frac{{4}}{{5}}D$$

$$\frac{{4}}{{5}}D$$

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$$\frac{{5}}{{4}}D$$

$$\frac{{5}}{{4}}D$$

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$$D$$

$$D$$

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$$2D$$

$$2D$$

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