The solution set x ≤ 2 or x ≥ 4 is consistent with an equation of the form

a) |ax + b| ≤c, where c is greater than zero.
b) |ax + b| ≥ c, where c is greater than zero.
c) |ax + b| = c, where c is less than zero.
d) |−ax + b| ≤ c, where c is less than zero.