What is the sequence of applying for an IP address in DHCP?
1. The host sends a DHCP Request message to apply for an IP address.
2. The DHCP server replies with a DHCP Offer message.
3. The host sends a DHCP Discovery message to search for the DHCP server.
4. The DHCP server replies with a DHCP ACK message after receiving the DHCP Request message.
A. 1-2-3-4
B. 1-4-3-2
C. 3-2-1-4
D. 3-4-1-2