The graph showing the concept of activation energy of enzyme is given below. Observe the graph and choose the correct option for M and N.


Column-I | Column-II | ||
|---|---|---|---|
| 1 | Pancreas | p | Pepsin |
| 2 | Gastric glands | q | Enterokinase |
| 3 | Small intestine | r | Ptyalin |
| 4 | Salivary glands | s | Trypsin |
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