Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?

Question: Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?
[A].

Layer 2

[B].

Layer 3

[C].

Layer 4

[D].

Layer 7

Answer: Option C

Explanation:

A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. A reliable connection is defined by a virtual circuit that uses acknowledgments, sequencing, and flow control, which are characteristics of the Transport layer (layer 4).