A customer team wants to retarget subscribers who click on links of key items promoted across email campaigns. The customer has indicated the following:
* Emails will be built using a custom dynamic template for these messages.
* Links will vary over time and across campaigns.
* Click activity will be cross-referenced with subscribers' regional markets on a master subscriber data extension.
* Retargeting messages will dynamically populate content based on regional market.
In order for this solution to be viable, which skill set does the customer team need to possess?

A Marketing Cloud admin is asked by the marketing team to ensure a default Header and Footer be added to emails.
Where under Setup could this be created?