Can you please explain this problem in more detail? I'm confused on how depreciation works when it comes to taxes whether its a deferred taxed asset, deferred tax liability, and something else!

Western Mountain Sports started 2018 having recognized $5,000,000 more depreciation for tax purposes than for accounting purposes since the company began. It ended 2018 having recognized $4,000,000 more depreciation for tax purposes than for accounting purposes since the company began. Assume a tax rate of 40%. With respect to depreciation, Western's tax expense journal entry for 2018 would include a: a. Debit to deferred tax liability for $400,000 b. Credit to deferred tax liability for $400,000 C. Debit to deferred tax liability for $1,600,000 d. Credit to deferred tax liability for $1,600,000