Acustomer frequently holds seminars and other events to interface with their customers. they plan to do the following: use smart capture forms to write data into event registration data extensions. cross-reference the records in each registration data extension with corresponding invitation email sends. send a follow-up email to customers who click on the registration link in the invitation email, but do not complete registration. which skill is needed to build an efficient solution?
a) ampscript
b) sql
c) html
d) css