Simplify the rational expression. Select the correct choice below and fill in any answer boxes in your choice. StartFraction x minus 4 Over 5 EndFraction (Simplify your answer. Use positive exponents only. Use integers or fractions for any numbers in the expression.) Find the numbers that must be excluded from the domain of the simplified rational expression in order for it to be equivalent to the original expression. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. x nothing (Use a comma to separate answers as needed.) B. There are no numbers excluded from the domain.