Which of the following protocol may be used as zeroconf and plug-and-play?

Step 1: DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices on a network, enabling them to join without manual configuration. This supports zeroconf (zero-configuration networking) and plug-and-play functionality.

Step 2: ICMP (Internet Control Message Protocol) is used for error reporting and diagnostics, such as ping, but does not assign IP addresses or manage network setup. Therefore, it cannot support zeroconf or plug-and-play.

Step 3: NAT (Network Address Translation) translates private IP addresses to public ones for internet access, but it does not assign IP addresses dynamically or enable automatic network discovery. Hence, it is not suitable for zeroconf.

Step 4: TCP (Transmission Control Protocol) is a transport layer protocol that ensures reliable data delivery, but it does not handle IP assignment or network configuration. Therefore, it cannot support plug-and-play functionality.