Two sides of triangle have lengths 9 and 18. Which inequalities describe the values that possible lengths for the third side

a) |9 - 18| < x < 9 + 18
b) 9 - 18 < x < 9 + 18
c) 9 + 18 < x < |9 - 18|
d) 9 - 18 < x < |9 + 18|