In Which of the Following Ways Do PPOs Differ from HMOs

In which of the following ways do PPOs differ from HMOs?

A) PPOs provide benefits on a prepaid basis.
B) Employees are required to use preselected plan service providers.
C) PPOs are generally less expensive plans.
D) PPOs have less in common with traditional fee-for-service plans.
E) Physicians are paid on a salary basis.