To answer this question, you need to understand the concept of data transfer on a network.
Option A) Data Packets - This option is incorrect because data packets are the units in which data is divided for transmission over a network. While data packets play a crucial role in transferring data, they do not ensure that data is transferred whole, in sequence, and without error.
Option B) Addressing - This option is incorrect because addressing is the process of identifying the source and destination of data packets. While addressing is important for routing data to the correct destination, it does not guarantee the integrity of data transfer.
Option C) Protocol - This option is correct because a protocol defines a set of rules and procedures for data communication. It ensures that data is transferred whole, in sequence, and without error by specifying how data should be formatted, transmitted, received, and acknowledged.
Option D) File services - This option is incorrect. File services refer to the functionality provided by a network for accessing and managing files. While file services can facilitate data transfer, they do not specifically ensure the integrity of data transfer.
The correct answer is C) Protocol. This option is correct because protocols define the rules and procedures for data communication, ensuring that data is transferred whole, in sequence, and without error.