I need help with letter D. please.

2. Inventories A. This question is designed to help you reason through the transactions related to accounting for inventories. For each of the transactions described below (items a and b), enter the effects of the transaction on the appropriate side (debit or credit) of the T-accounts affected. Note that the Cash and Accounts Payable accounts are not included in the T-accounts shown below, but would be credited for the expenditures involved in transaction a. a. Cost of items purchased or made. b. Cost of items sold. Balance Sheet / Income Statement Cost of Goods Sold Beginning Balance Ending Balance Total for the Period B. Assume that the company does not keep track of the physical items sold and does not record the cost of an item sold at the same time that the sale is recorded. Assume also that the company does actually count (and determine the cost of) its inventory at the end of every accounting period. Construct a model (i.e., equation) that this company could use to calculate the cost of goods sold at the end of the period. d If the beginning balance of the inventory account and the cost of items purchased or made during the period were correct, but an error resulted in understating the firm's ending inventory balance by $4,000, would the firm's net income be affected? If your answer is "yes," explairn the amount and direction (overstated-too high or understated-too low) of the effect on net ncome