A chord AB of a circle C1 of radius (√5 + 2) cm, touches a circle C2 which is concentric to O. If the radius of C2 is (√5 - 2) cm then length of AB is –

A chord AB of a circle C₁ of radius (√5 + 2) cm, touches a circle C₂ which is concentric to O. If the radius of C₂ is (√5 - 2) cm then length of AB is –
1). \(4\sqrt {20}\) cm
2). \(4\sqrt[4]{{20}}\) cm
3). \(2\sqrt[8]{{20}}\) cm
4). \(4\sqrt[8]{{20}}\) cm

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