The following table shows the length and width of a rectangle:

Length Width
Rectangle A 3x + 2 2x − 1

Which expression is the result of the perimeter of rectangle A and demonstrates the closure property?
2x + 2; the answer is a polynomial
2x + 2; the answer may or may not be a polynomial
10x + 2; the answer is a polynomial
10x + 2; the answer may or may not be a polynomial