Given that 0 < a < b < c < d, which of the following is the largest?

TCS · 2025

1. A.

   (c+d) / (a+b)

2. B.

   (a+d) / (b+c)

3. C.

   (b+c) / (a+d)

4. D.

   (b+d) / (a+c)

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