When building content for an email, what would a marketer consider in the Call to Action? (Choose 2)

A marketer is configuring Path Optimizer in Journey Builder to test three different email subject lines. They want to configure a holdback audience to receive the winning path, but the option is unavailable.
Why would themarketer be unable to configure a holdback audience?

A client leverages transactional messages to send ad-hoc order confirmations. Which type of message is most suitable in this situation?

Northern TrailOutfitters (NTO) specializes in delivering snack boxes to its members. NTO offers a 90-day trial on the snack boxes. NTO would like to send out a series of emails to educate and remind members to purchase the snack box subscription before the 90-day trialends. Which tool is recommended for this scenario?

Northern Trail Outfitters (NTO) has a Master Subscriber data extension that contains profile and preference information. Various segments are created from the Master Subscriber data extension and each segment will needto be automatically refreshed daily.
Which two activities should NTO consider using? (Choose two.)