The chord of the contact of tangents drawn from a point on the circle x2 + y2 = a2 to the circle x2 + y2 = b2 touches the circle x2 + y2 = c2 such that bm = ancp, where m, n, p ϵ N and m, n, p, are prime to each other, then the value of m + n + p - 3 is:

• A. -1
• B. 2
• C. 0
• D. 1