Final answer:
The carrier or bailee's obligation, once notified of stoppage of transitu, is to act upon the notice promptly.
Step-by-step explanation:
Once a carrier or bailee has been notified of stoppage of transitu, their obligation is to act upon the notice promptly. This means that they are required to take immediate action to interrupt the delivery of the goods. The carrier or bailee must not continue the transit and should comply with the stoppage of transitu notice.