A network administrator notices that devices recently brought into the office are unable to connect to the wireless network, despite older devices functioning without any issues. After checking the relevant server managing network address distribution, it's apparent that the pool of available network addresses has been completely allocated. How should the network administrator rectify this situation?
Set up predetermined network addresses for the recently added devices.
Shorten the duration for which network addresses are allocated to devices.
Expand the range of allocatable network addresses or add a new allocation scope.
Reboot the server responsible for network address allocation.