Q1.35

There are five records in a database.

$$\begin{array}{|c|c|c|c|} \hline \textbf {Name} & \textbf {Age} & \textbf {Occupation} & \textbf{Category } \\\hline \text{Rama} & \text{27} & \text{CON} & \text{A} \\\hline \text{Abdul} & \text{22} & \text{ENG} & \text{A} \\\hline \text{Jennifer} & \text{28} & \text{DOC} & \text{B} \\\hline \text{Maya} & \text{32} & \text{SER} & \text{D} \\\hline \text{Dev} & \text{24} & \text{MUS} & \text{C} \\\hline \end{array}$$

There is an index file associated with this and it contains the values $1, 3, 2, 5$ and $4$. Which one of the fields is the index built from?