2) If a firm does not expect to be able to recover its future tax assets, GAAP requires them to establish a valuation allowance. Briefly describe the accounting for tax valuation allowances by determining what accounts increase and decrease when: a) the firm establishes the valuation allowance b) the firm writes off a tax asset c) the recovers a tax asset that it had previously written off d) the firm adjusts the valuation allowance for improved conditions