Identify all false statements. $1.$ U$.$S$.$ GAAP allows companies to consistently use different inventory methods for inventories in different segments. $2.$ IRS's LIFO conformity rule aims to prevent companies from using LIFO to save taxes while using FIFO to report higher net income to investors. $3.$ FIFO likely results in higher operating cash flows because it produces the lowest cost of goods sold among all inventory methods during price rising period. $4.$ Many companies use FIFO for operating decisions and convert to LIFO for external financial reporting & tax filings by adding LIFO reserve to FIFO ending inventory. $5.$ U$.$S$.$ tax revenue will increase if U$.$S$.$ GAAP prohibits LIFO.