Match the hormone with its site of production:

| Hormones | Chemical Nature |
|---|---|
| A) Insulin | IV) Protein |
| B) Estrogen | I) Steroid |
| C) Oxytocin | II) Peptide |
| D) Thyroxine | III) Amine |
Match the following:
In the following, \( [x] \) denotes the greatest integer less than or equal to \( x \). 
Choose the correct answer from the options given below:
For x < 0:
f(x) = ex + ax
For x ≥ 0:
f(x) = b(x - 1)2