Which three statements about DHCPv4 are true?
1) The DHCPREQUEST message is sent by a DHCP client to locate a DHCP server.
2) The DHCPOFFER message is sent by a DHCP server after receiving a DHCPDISCOVER message from a client.
3) All DHCP communications are broadcast.
4) DHCP uses ports 67 and 68.
5) DHCP messages use UDP as a transport protocol.
6) The DHCPACK message is sent by the DHCP server to provide the DHCP client with the DHCP server MAC address for further communications.