Which two methods are viable configurations for entry?

A company is hosting a series of events and wants its customers who register to enter into a journey.

Which two methods are viable configurations for entry? Choose 2 answers
A . A form hosted on the company website that fires the entry event via REST AP
C . A Smart Capture form hosted in CloudPages that updates a Profile attribute.
D . A Smart Capture form hosted in CloudPages that populates the entry source.
E . A form hosted on the company website that fires the entry event via SOAP AP

Answer: C,D