CLEAN : STOCKSHOTS: Copenhagen's Central Station on new M3 line

The video tutorial introduces the topic of Blackboard 139 and includes a brief acknowledgment.

What is the main topic introduced in the first section?

• Whiteboard 140

• Whiteboard 139

• Blackboard 140

• Blackboard 139

What is the response given after the introduction of Blackboard 139?

• No

• Not sure

• Maybe

• Yeah