A point M lying on the line joining the centers of two circles of different radii, is distant from their circumferences by 3 cm and 4 cm. The transverse common tangent of the two circles passing through point M intersect each other at 90. Find the length of the transverse tangent.?

A) 7 (√2 – 1)

B) 7 (√2 + 1)

C) 105 (√2 -1)

D) Cannot be determined