Answer D is the technically correct selection. TCP establishes a connection before transmitting application data, while UDP sends without guaranteeing delivery. TCP uses sequencing, acknowledgments, retransmissions, and flow control; UDP has lower overhead but leaves reliability to the application if needed. This aligns with Cisco CCNA 200-301 v1.1 because the exam blueprint requires engineers to recognize operational behaviour from configuration symptoms and topology requirements. The other options reverse the protocols or incorrectly claim UDP performs TCP-style recovery. Treat the distractors carefully: most are real Cisco terms, but they solve a different problem or operate at a different layer. The selected answer is the one that would be used by an engineer on the device or in the design to produce the outcome stated in the question.