Overnight the DHCP Server Went Down

Multiple Choice

Overnight the DHCP server went down. The server provides dynamic IP address for the computers in the office network (using the IPv4 standard) . You have the server backup but not all of the computers can connect to the network. What command/commands do you use to reconnect the computers to the server and obtain an IP address?

A) Ipconfig /refresh
B) Ipconfig /release and then ipconfig /renew
C) Ipconfig /release and then ipconfig /refresh
D) Ipconfig /all