Final answer:
The 'Frame Type' in a network frame indicates the size of the data payload when less than 1500 bytes or the type of data format if the number is greater than 1500.
Step-by-step explanation:
The student is asking about the part of a network frame that indicates the size of the data payload or the type of data format being used. The correct answer to the student's question is 'c. Frame Type'. In networking, the Frame Type field of the Ethernet frame header can either indicate the size of the data payload if it is less than 1500 bytes, which is the maximum size for the data field of a standard Ethernet frame, or it can indicate the specific data format like IP (Internet Protocol) or IPX (Internetwork Packet Exchange) when the number is greater than 1500.