How do you ensure that existing users re-consent on their next login?

The customer’s legal team want to release a major update to terms of service.

How do you ensure that existing users re-consent on their next login?
A . Update only Effective as of.
B. Update tags in Screen-Sets.
C. Update both Effective as of and Re-consent cut-off.
D. Update only Re-consent cut-off.

Answer: C