Which one of the following descriptions about DHCP is NOT correct?

Question $2$ options:

A DHCP offer includes client's MAC address, the IP address that the server is offering, subnet mask, lease duration and the IP address of the DHCP server.

The IP address offered by the DHCP server is always an external IP address so that the client can connect to the Internet.

It is a protocol for a computer to obtain its IP address from its local area network while connecting to it$.$

DHCP Server uses the UDP port $67$ and DHCP client uses UDP port $68.$