Name which TCP feature allows the receiver to inform the sender of exactly which data has been recei

Name which TCP feature allows the receiver to inform the sender of exactly which data has been received, allowing the sender to retransmit only missing data and not data that has been successfully received.

A.
Partial packet retransmission

B.
RACK (Relative Acknowlegment)

C.
TCP Reconnect

D.
SACK (Selective Acknowledgement)