A French Intl.Collator with sensitivity: "base" returns 0 for two account names. What can…

A French Intl.Collator with sensitivity: "base" returns 0 for two account names. What can the application conclude?

1. They compare as equivalent for that display collation policy only.
2. They are the same account and may be merged.
3. Their UTF-8 byte sequences are identical.
4. They are canonically equivalent under NFC.