Suppose a firm has had the historical sales figures shown as follows. What would be the forecast for next year's sales using the average approach if it is determined that none of the years are "stale"?Year$20172018201920202021$Sales$ $1,600,000$$ $1,500,000$$ $1,700,000$$ $1,700,000$$ $1,800,000$Multiple Choice$$1,800,000$$$1,700,000$$$1,660,000$$$1,600,000$