. P is the centre of the two concentric circles

P is the centre of the two concentric circles having radius 3 cm and 5 cm. Two tangents are drawn from point A which is outside the circle. Tangents AM touches the smaller circle at point M and tangent AN touches the bigger circle at point N. If AM = 13 cm then AN = ?

1. 153 cm      

2. 178 cm

3. 191 cm      

4. 161 cm