For each of the following situations, identify the type of change and whether the change (or correction) should be made procpectivily or retrospectively. Change ( or correction) Type of Change to beMade (a) When the company purchased a piece of machinery several years aga the accounting clerk posted the debit journal entry to "maintenance expense" instead of "machinery". This was only discovered in the current fiscal year. (b) When the company purchased its building, it estimated that the building would have a useful life of thirty years. Now, ten years later, it appears that the building will be useful for a further twenty-five years from the current date. (c) Historically, the company used a complex formula to calculate depreciation that was not recognized by either ASPE or IFRS. This year, the company changed to straight-line depreciation. (c) Historically, the company used a complex formula to calculate depreciation that was not recognized by either ASPE or IFRS. This year, the company changed to straight-line depreciation. (d) In the current year it was announced that the IFRS accounting policy for a specific type of transaction had changed. The new policy specified that all companies affected by the change were required to restate all prior years that would be shown on their comparative financial statements. (e) Management of the company elected to change from one depreciation method to another, on the rationale that the pattern of benefits had changed