What is the primary difference between a sWhich of the following is true about standard costs? Group of answer choices They are difficult to use with a process costing system They are estimates of costs attainable only under the most ideal conditions They require that significant unfavourable variances be investigated, but do no require that significant favourable variances be investigated They can, if properly used, help motivate employeestatic budget and a flexible budget? Group of answer choices Both the static budget and the flexible budget are adjusted for different activity levels The static budget contains only fixed costs, while the flexible budget contains only variable costs The static budget is adjusted for different activity levels, while a flexible budget is prepared for a single level of activity The static budget is prepared for a single level of activity, while a flexible budget is adjusted for different activity levels