Final answer:
To opt Erin out of auto-renew and take advantage of a multi-year renewal, use the inquiry code for cancelling auto-renewal and contact the appropriate party to make the request.
Step-by-step explanation:
To opt Erin out of auto-renew and take advantage of a multi-year renewal, you would use the inquiry code for cancelling auto-renewal. For example, the code could be something like 'CANCELAR'. By using this code when contacting the appropriate party, Erin can request to opt out of auto-renewal and switch to a multi-year renewal plan. This will prevent her subscription from automatically renewing and allow her to take advantage of the multi-year renewal option.