The tax rate in Terri's county is given by the equation y = 0.06x, where y represents the amount of tax in dollars and x represents the purchase price in dollars.
Based on this equation, which statement is true?
O Both the domain and range are all real numbers.
O The domain is 0.06, and the range is all real numbers.
O Both the domain and range are greater than or equal to zero.
O The domain is greater than or equal to zero, and the range is all real numbers.