The answer is B. book mark definitely
Answer:
Type of service field
Explanation:
Data messages are transmitted in packets known as IP datagram. The IP datagram consist of header (which carries the header and control field) and payload (it carries the information).
The type of service field is an eight bit field carries information about the quality of service (QoS) features. The QoS allow routers to prioritize IP datagrams like which datagram is important than other datagram.
Keratin- a protein (Hope that helps!)