Which choices are TCP features? (Choose three.)

The features associated with TCP (Transmission Control Protocol) play an essential role in ensuring reliable communication over computer networks. The correct selection highlights key aspects of TCP functionality.

Flow control is a crucial feature that helps manage the rate of data transmission between sender and receiver, ensuring that the sending device does not overwhelm the receiving device. This is typically achieved through mechanisms like the sliding window protocol, which allows the sender to send multiple packets before needing acknowledgement, while still keeping track of the amount of data being transmitted.

Packet error recovery is another important feature of TCP. It ensures that if packets are lost, corrupted, or arrive out of order during transmission, they can be recovered. TCP uses sequence numbers and acknowledgments to track packet delivery, allowing lost packets to be retransmitted.

Demultiplexing is also covered in the context of TCP by handling multiple connections from different applications. TCP uses ports to distinguish between different sessions, allowing multiple applications to use network resources simultaneously without data confusion.

Understanding these features is essential in appreciating how TCP maintains the integrity and efficiency of data flow across networks, which makes option B the correct selection. The other options include features that either don't pertain directly to TCP or are features of different protocols.