Q 3032801732.     AB and CD are respectively arcs of two concentric circle of radii 42 cm and 14 cm and centre O as shown in the adjoining figure. If `\angle AOB = 30^{\circ}`, then the area of the shaded region is

A

` \frac{1232}{3} cm^2`

B

`\frac{1220}{3} cm^2`

C

`411 cm^2`

D

None of these

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