Which activity can be used to iterate through an Array?

The activity used to iterate through an Array is the 'For each' activity. This activity is specifically designed to loop through collections of items, such as arrays, lists, and other enumerable types. It allows the developer to access each element individually and perform a specific action on it, making it highly efficient for processes that require repeated operations on each element.

When using the 'For each' activity, you define the collection (in this case, an Array), and the activity automatically handles the iteration through each element, which simplifies the coding process and reduces the likelihood of errors that can occur in manual loops.

The other activities, such as 'While' and 'Do While', are used for conditional looping, where the execution continues as long as a certain condition is met. However, these are not specifically tailored for iterating through arrays in a straightforward manner. They require manual management of index counters and conditions to ensure that elements are accessed correctly.

The 'Switch' activity, on the other hand, is used for branching logic, where different actions are taken based on the evaluation of a specific condition—this does not pertain to iteration of arrays. Thus, the 'For each' activity is the most appropriate choice for iterating through arrays effectively.