How should the CK system administrator configure self-registration?

Cloud Kicks (CK) wants potential customers to use self-registration to sign up and gain access to its new site. CK uses Person Accounts for its customers.

How should the CK system administrator configure self-registration?
A . Leave the Account field blank.
B. Create a trigger on User to convert the Contact to a Person Account.
C. Set the profile to the standard Person Account profile.
D. Create a flow to convert the Contact to a Person Account.

Answer: C