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$\text{A, B, C}$ are three numbers.

Let $@ \text{(A, B)} =$ average of $\text{A}$ and $\text{B}$,

$/ \text{(A, B)} = $ product of $\text{A}$ and $\text{B}$, and

$\text{X(A, B)} = $ the result of dividing $\text{A}$ by $\text{B}$

The sum of $\text{A}$ and $\text{B}$ is given by

- $/(@\text{(A, B)}, 2)$
- $X(@\text{(A, B)}, 2)$
- $@(/\text{(A, B)}, 2)$
- $@(X\text{(A, B)}, 2)$