How did settlers travel the correct route to the Pacific Northwest?

(1 point)
Responses

They used the best guess they could make.
They used the best guess they could make.

They followed the signs along the trail.
They followed the signs along the trail.

They watched for landmarks along the way.
They watched for landmarks along the way.

They followed the Columbia River.
They followed the Columbia River.

They followed established trails and routes created by fur trappers and Native American tribes.