If a company's inventory levels increase from 30 days of sales to 50 days of sales, it may indicate that O the company is experiencing either a decreasing demand for its products or is building inventory in anticipation of greater seasonal demand. O the company has switched to the FIFO method of inventory accounting in a period of falling prices. O the company has switched to the LIFO method of inventory accounting in a period of rising prices. O the company's inventories have increased in value due to appreciation in their value after purchase or production