When considering the time period a budget should cover, which of the following is/are true? A budget should always be prepared for a full year, or the operating cycle, whichever is longer. II: The time period covered by a budget may depend on the type of budget or the costs being budgeted. III: The budget time period should be long enough to minimize seasonal fluctuations. IV: The budget period should not be so long that reliable estimates are not possible. OI only OI and II OI, II, III O II, III, IV O II, IV