What must be true about each Period Cost in a program?

For each Period Cost in a program, the requirement that it should be listed under a single month ensures clarity in financial reporting and budgeting. This categorization allows marketers and finance teams to accurately assess the costs associated with different time frames, making it easier to analyze performance over specific periods.

By aggregating costs incurred within the same month, it becomes simpler to link expenses to corresponding marketing activities and measure their effectiveness. This practice also aids in maintaining organized records for financial audits and optimally planning future budgets.

Other options may relate to broader strategies or financial management practices, but they do not specifically address the functional need for organizing period costs in a month-specific manner.