A. The user has received an IBE notification email, but has not accessed the HTTPS URL or attachment yet.
B. The user account has been de-activated, and the user must register again the next time they receive an IBE email.
C. The user was registered by an administrator in anticipation of IBE participation.
D. The user has completed the IBE registration process, but has not yet accessed their IBE email.
Explanation:
Reference: https://docs.fortinet.com/document/fortimail/6.4.2/administration-guide/470401/configuring-ibe- users