The primary difference between a static budget and a flexible budget is that a static budget Oa. is a plan for a single level of production, whereas a flexible budget can be converted to any level of production Ob. is suitable in a volatile demand situation while a flexible budget is suitable in a stable demand situation Oc. is concerned only with future acquisitions of fixed assets, whereas a flexible budget is concerned with expenses that vary with sales Od. includes only fixed costs, whereas a flexible budget includes only variable costs