You want to send login instructions, such as URL, username, and password, to a new external user. You want to email to be automatically deleted from the user’s inbox in two days. What should you do?

A. Call the user and provide them with login instructions over the phone
B. Email the user and ask them to delete the email in two days
C. Send the URL and username in one email, and send the temporary password in another

D. Create the email in confidential mode. Set the email to expire in two days

Reference: https://support.google.com/a/users/answer/9381514?hl=en