"D" is correct
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html#:~:text=The%20port%20that%20receives%20the,ones%20any%20other%20bridge%20sends.
Can the last part be re-worded to "from a bridge" instead of "on a bridge"? All ports on a root bridge are designated ports. It sends normal traffic in and out of its ports, but when it comes to BPDUs, it only sends out.
Ref: Understanding Rapid Spanning Tree Protocol (802.1w) – Cisco
“...
Port Roles
Root Port Roles
• The port that receives the best BPDU on a bridge is the root port.
...”
A. The designated port
Wrong answer.
B. The backup port
Wrong answer.
C. The alternate port
Wrong answer.
D. The root port
Correct answer.
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