Which of the following agents are approved for treatment of narcolepsy.. Dextroamphetamine

Which of the following agents are approved for treatment of narcolepsy?
l. Modafinil
ll. Methylphenidate
lll. Dextroamphetamine.

A. l only
B. lll only
C.l and ll only
D. ll and lll only
E. l , ll and lll