Final answer:
Use a static list for a drip campaign when dealing with a defined, unchanging set of recipients, such as for a welcome series or a fixed educational course.
Step-by-step explanation:
Using a static list for a drip campaign is appropriate when you have a defined group of recipients who will not change over time.
This could be used for certain marketing scenarios like a welcome series for new subscribers or a set educational course where new participants do not need to be added into the middle of the sequence.
Static lists work well for targeting specific segments of your audience with a timeless message or offer that does not require personalization based on user behavior or other dynamic criteria.