• Check out industry reports that can help you predict query demand and set budget accordingly.
• Send a supervisor a quarterly budget review as part of a request for additional testing allocations for the upcoming quarter.
• Create a monthly or weekly sync with the finance team in order to foster collaboration, share news and ideas about campaigns, and encourage flexibility in the budget.
• Set aside a percentage of the budget for use in experiments and response to market changes.

The correct answer is: Set aside a percentage of the budget for use in experiments and response to market changes.

Explanation: Maintaining budget flexibility on a fixed annual plan for campaign experiments is possible through strategic budgeting. An effective method entails setting aside a portion of the budget specifically for conducting experiments and adjusting to market changes. This proactive approach allows for innovative testing of campaign effectiveness and swift reactions to market dynamics, all within the framework of the annual budget.