Final answer:
In the context of computer networking, if the cwnd stays constant but grows exponentially, it indicates a mechanism called slow-start, which is part of the congestion control algorithm used in TCP.
Step-by-step explanation:
In the context of computer networking, congestion control refers to the methods and techniques used to manage the flow of data in a network to prevent congestion.
When the cwnd (congestion window) stays constant but grows exponentially, it indicates a mechanism called slow-start, which is part of the congestion control algorithm used in TCP (Transmission Control Protocol).
During slow-start, the cwnd increases exponentially until congestion is detected, at which point the algorithm shifts to a more conservative approach to prevent network congestion. Therefore, the correct answer is d) Congestion control.