Answer:
Data field.
Explanation:
In Computer Networking, data encapsulation can be defined as the process of adding a header to a data unit received by a lower layer protocol from a higher layer protocol during data transmission. This ultimately implies that, the header (segment) of a higher layer protocol such as an application layer, is the data of a lower layer such as a transportation layer in the Transmission Control Protocol and Internet Protocol (TCP/IP).
Basically, an Ethernet Frame is one of the IEEE 802.3 data encapsulation standards.
An Ethernet Frame can be defined as the building blocks or bits contained in a single packet of data that is being transmitted over an Ethernet network or connection. When data are transmitted, a frame check sequence (FCS) containing a 4-bytes is used to detect or check for any error in a frame and to ensure no frame data was corrupted in the course of the transmission.
In the transmission control protocol (TCP), all frames that are being transmitted must have a minimum of 64-bytes in length and as such when small packets are encapsulated, some additional bits referred to as pad are typically used to increase the frame size to at least 64-bytes, which is the minimum size.
Hence, a data field is the part of an Ethernet Frame that uses a pad to increase the frame field to at least 64 bytes.