What is the best way to allow sales to accomplish this?

"LenoxSoft’s marketing team developed a cross-selling engagement studio program for customers who have 1 or more of their products. They want to empower sales users who have Salesforce Engage licenses to make sure their contacts are included in the program.

What is the best way to allow sales to accomplish this?
A . Add contacts to the program’s Campaign as campaign members.
B. Export contacts from Salesforce and import them into Pardot.
C. Use the Add to List completion action on forms.
D. Use the Add to Nurture action on page layouts.

Answer: A