Correct option is D
• Mesh Wi-Fi systems use multiple interconnected nodes spread throughout the building, ensuring seamless blanket coverage and eliminating dead zones → Assertion is true.
• The reason incorrectly claims Mesh uses a single node, which is opposite of how Mesh works → Reason is false.
• Mesh advantage comes from distributed nodes communicating dynamically, not from a single source router.
Hence, only the Assertion is correct.