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 API.
B. A Smart Capture form hosted in CloudPages that updates a Profile attribute.
C. A Smart Capture form hosted in CloudPages that populates the entry source.
D. A form hosted on the company website that fires the entry event via SOAP API.

Answer: C,D