If A means '+ ', B means '- ', C means '×' and D means ' ÷', then what will come in place of the question mark (?) in the following equation?
10 A 30 D 6 B 2 C 3 = ?

Expression:
10 A 30 D 6 B 2 C 3
= 10 + 30 ÷ 6 − 2 × 3

​$$\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[], {}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\\hline \text{Addition} &+ \\ \hline \text{Subtraction} & - \\\hline\end{array}$$​​

Explanation:
30 ÷ 6 = 5
2 × 3 = 6

Now expression becomes:
10 + 5 − 6

= 15 − 6
= 9

Final Answer:
9

Thus, the correct option is: (a)