Final answer:
The correct response under IFRS regarding changes in tax rates is that they should be recorded immediately on existing deferred tax accounts, the correct answer to the student's question is: Companies should record the effect of changes in tax rates on deferred tax accounts immediately, which corresponds to option (a) I Only.
Step-by-step explanation:
Under IFRS when a change in the tax rates is enacted, companies should record its effect on existing deferred tax accounts immediately. This rule is because deferred taxes represent future tax effects of current transactions and events, and hence, when tax rates change, the amounts of deferred tax assets and liabilities must also change to reflect the rate at which they will be settled or realized in the future. Therefore, the correct answer to the student's question is: Companies should record the effect of changes in tax rates on deferred tax accounts immediately, which corresponds to option (a) I Only.