After sending an initial 'welcome' email, Northern Trail Outfitters needs to configure Journey Builder to continue a customer acquisition journey after a purchase is made on its website.
Which type of activity should be used?

Northern Trail Outfitter historically received a bulk data file from a vendor per day in its Marketing cloud SFTP. The vendor is updating its sending cadence and will be delivering files over approximately eight hours throughout the day. The files will maintain the same naming convention and include a timestamp.
Which update should be implemented to the automation to process the fries as they are received while minimizing network?

A marketer with Northern Trail Outfitters needs to review how different variations of an email will render in different email clients.
Which tool should the marketer use?

The marketing team has been troubleshooting why an email was not sent to 10% of the audience within the data extension. When they review the tracking for the job ID, they see 0 subscribers were held or unsubscribed.
Which additional issues should they consider?

Northern Trail Outfitters (NTO) receives a complaint from a long-time customer who claims that, despite providing an updated email address, they are still receiving emails at an old address. NTO confirms that the customer's new email address is stored in the target data extension.
What is preventing the customer from receiving emails at their new address?