During a network capture in Wireshark, you capture some IP traffic. In the IP Datagram, what is the function of the Protocol field?

A.
This field is used to tell the upper layer protocols that IP is being used.

B.
This field is used to tell the lower layer protocols that IP is being used.

C.
This field is used to define the lower layer protocol to IP.

D.
This field is used to define the upper layer protocol to IP.

E.
This field is used to identify the version of the IP Protocol in use.