Match List I with List II and choose the correct option.

List 1

1. ∫x/(1+x²)²dx

2. ∫x³/(1+x⁴)²dx

3. ∫2x/(1+x²)³ᐟ²dx

4. ∫4x³/(1+x⁴)³ᐟ²dx

List 2

1. -2/√(1+x⁴)+C

2. -2/√(1+x²)+C

3. -1/[2(1+x²)]+C

4. -1/[4(1+x⁴)]+C