In the following paragraph, a sentence contains two pairs of words enclosed in parentheses. Determine which word in each pair correctly completes the sentence. Then select the answer choice containing the two words that you have selected.

Budgeting approaches can be classified as static or flexible budgets, or as rolling or period budgets. A health plan most likely would use a (static / flexible) budget when a budget's objective is to reduce or limit expenses, and the health plan most likely would use a (rolling / period) budget if it would like to continually maintain projections for a certain time period into the future.