In the figure given, two circles with centres \( C_{1} \) and \( C_{2} \) are 35 units apart, i....

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In the figure given, two circles with centres \( C_{1} \) and \( C_{2} \) are 35 units apart, i.e. \( \mathrm{C}_{1} \mathrm{C}_{2}=35 \). The radii of the circles with centres \( \mathrm{C}_{1} \) and \( \mathrm{C}_{2} \) are 12 and 9 respectively. If \( \mathrm{P} \) is the intersection of \( \mathrm{C}_{1} \mathrm{C}_{2} \) and a common internal tangent to the circles, then \( l\left(\mathrm{C}_{1} \mathrm{P}\right) \) equals-
W
(A) 18
(B) 20
(C) 12
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