Match the following:

Let us check the lengths of the given network protocol fields:

• P. UDP Header's Port Number: Both Source and Destination port numbers in the UDP header are $16\text{ bits}$ (2 bytes) each $\rightarrow$ IV.

• Q. Ethernet MAC Address: An Ethernet MAC address is a 48-bit (6-byte) physical address $\rightarrow$ I.

• R. IPv6 Next Header: The Next Header field in the base IPv6 header specifies the type of the next header/protocol and is $8\text{ bits}$ (1 byte) $\rightarrow$ II.

• S. TCP Header's Sequence Number: The Sequence Number field in the TCP header is $32\text{ bits}$ (4 bytes) long $\rightarrow$ III.

Matching pairs:

Hence, Option C is the correct answer.