When a programmer decides to use UDP as a transport protocol, what is a decision factor?

A. Redundancy of acknowledgment is not needed.
B. Guaranteed delivery of segments is required.
C. Windowing flow control is required.
D. A virtual circuit is required.

A. When a programmer decides to use UDP, it is normally because the programmer is sequencing and acknowledging datagrams already. The redundancy of acknowledgments at the Transport layer is not needed.