To represent \(4 \cdot 7\) with a model, the best response from your list would be:
7 plus 7 plus 7 plus 7 (7 + 7 + 7 + 7).
This shows \(7\) added together \(4\) times, which is equivalent to \(4 \cdot 7\).
Other expressions like \(28\) or \(7 \cdot 4\) also relate to the number but do not represent it in a modeling context as clearly as the repeated addition does.