In an IEEE 802.3 Ethernet frame, what is the significance of the DSAP field?

In an IEEE 802.3 Ethernet frame, what is the significance of the DSAP field?
A . The DSAP field specifies the TCP or UDP port that is associated with the transport protocol.
B . The DSAP field is only used on United States Department of Defense networks to indicate the information classification level.
C . The DSAP field is only used in Ethernet II frames.
D . The DSAP field indicates the network layer protocol.

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Answer: D