Explanation
To copy journeys across business units, NTO should use Journey Templates1. Journey Templates are reusable journey structures that can be created and shared across business units. NTO can use Journey Templates to replicate journey structure so it can be easily recreated in another account. The other options are incorrect because:
Deployment Manager. This is a tool that allows NTO to deploy assets and configurations across business units or accounts. However, this tool does not support journeys as an asset type, so it cannot be used to copy journeys across business units2.
Journey Extracts. This is a feature that allows NTO to export journey data and metrics for reporting and analysis purposes. However, this feature does not allow NTO to copy or import journeys across business units; it only provides a snapshot of journey performance3.
Copy activities. This is an option that allows NTO to copy individual activities within a journey and paste them in the same or another journey. However, this option does not allow NTO to copy the entire journey structure across business units; it only copies one activity at a time4.