Free Cisco CCNP Switching Questions

Which one of the following answers represents configuration commands needed to implement a DHCP relay function?

a.
interface vlan 5
ip address 10.1.1.1 255.255.255.0
ip helper-address 10.1.1.10

b.
interface vlan 5
ip address 10.1.1.1 255.255.255.0
ip dhcp-relay

c.
ip dhcp pool staff
network 10.1.1.0 255.255.255.0
default-router 10.1.1.1
exit

d.
hostname Switch
ip helper-address 10.1.1.10