What command is most appropriate to restore the server to service?

A Linux server is running in single user mode, but the problem that existed before is now fixed. What
command is most appropriate to restore the server to service?

A.
reboot

B.
telinit 2

C.
shutdown -r now

D.
telinit 3

E.
shutdown -h now

Explanation:
see http://en.wikipedia.org/wiki/Runlevel
ID Name Description
1 Single-User Mode Does not configure network interfaces, start daemons, or allow non-root logins.
2 Multi-User Mode Does not configure network interfaces or start daemons.
3 Multi-User Mode with Networking Starts the system normally.
4 Not used/User-definable For special purposes.
5 X11 As runlevel 3 + display manager.