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Every acknowledgement increases the congestion window size by one.

Which phase does it refer?

a) Slow start phase

b) Fast retransmit

c) Fast recovery

d) Congestion Avoidance
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D?
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Even I thought was D
The solution given is A

But the window size will increase exponentially in slow start isn't it?
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You are right Vipin Rai

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Thank you
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I think the answer may vary according to the nature of acknowledgement .

If acknowledgement is always cumulative , then it's congestion avoidance , since every RTT window size increases by 1 only.

If acknowledgement comes for every segment , then it is slow start phase , because let's say current window size is 4 , so acknowledgement comes for every segment , and window size increases per ack. So after 4 ack's , new window size is 8 . Thus per RTT window size increases exponentially.

Correct me if i went wrong somewhere.
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Slow start (when window grows exponentially) is followed by Congestion avoidance phase after reaching threshold (when window grows linearly)

https://www.geeksforgeeks.org/computer-network-tcp-congestion-control/

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How D can be the correct answer? After every ack cwnd=cwnd+1, it happens in the slow start phase.
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No need to refer any link, after getting the acknowledgment if you are increasing window size by 1, then only it can grow exponentially. Ans will be A only.
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Didn't get what you are trying to say.
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https://gateoverflow.in/204088/gate2018-14

@utkarsh I think it should be option d

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D) Congestion Avoidance.

The value for the congestion window size will be increased by one with each acknowledgement (ACK) received, effectively doubling the window size each round-trip time.

by (163 points)
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D) Congestion Avoidance.

The value for the congestion window size will be increased by one with each acknowledgement(ACK) received, effectively doubling the window size each round-trip time.

What you're telling is slow start phase ,

In congestion avoidance , per acknowledgement window size increases by 1/congestion window size.

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