How should a deferred income tax valuation allowance be classified in the balance sheet?

Select one:

a. It should be allocated proportionately between the current and noncurrent portions of the deferred tax asset.

b. It should be allocated proportionately between deferred tax assets and deferred tax liabilities.

c. It should be added to the deferred tax asset.

d. It should be allocated proportionately between the current and noncurrent portions of the deferred tax liability.