What is the main difference between a flexible budget and a static budget?

The flexible budget reflects the number of units sold, while a static budget is prepared only for units produced.

The flexible budget contains only variable costs, while the static budget contains only fixed costs

The flexible budget is adjusted for different activity levels, while a static budget is prepared for a single level of activity.

The flexible budget obtains input from all levels of management, while a static budget is constructed using input from only upper level management.