Which of the following statements is true concerning the management of the client with a herniated disc?

a. Muscle relaxants and narcotics can be used to control moderate pain but should be discontinued after 3 weeks of use.
b. An epidural injection is helpful in reducing leg pain that has persisted for at least 3 weeks after the herniation occurred.
c. Intolerable pain for more than a 3-month period is an indication for surgical intervention.
d. All of the above