Which two AMPscript functions should be used in the setup?

An email requires custom AMPscript to append the subscriber’s zip code to a link in the email. A field name zipcode already exist in the sending data extension. Its important Marketing Cloud tracks subscribers who click on the link .

Which two AMPscript functions should be used in the setup? Choose
A . 2Lookup
B. Contact
C. RedirectTo
D. HTTPGet

Answer: B,C