The expression to find the perimeter of a rectangle is 2(length + width). What is the perimeter, in units, of a rectangle of length fraction 1 over 7 unit and width fraction 1 over 2 unit? (1 point)

a
fraction 1 and 1 over 7 units

b
fraction 1 and 2 over 7 units

c
fraction 4 over 9 unit

d
fraction 2 over 9 unit