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Answer the question on the basis of the information given below:

In the adjoining figure, I and II are circles with centres P and Q respectively. The two circles touch each other and have a common tangent that touches them at points R and S respectively. This common tangent meets the line P and Q at O. The diameters of I and II are in the ration $4:3.$ It is also known that the length of PO is $28$ cm.

What is the radius of the circle II?

  1. 2 cm
  2. 3 cm
  3. 4 cm
  4. 5 cm
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