Database.insert(records, false):
The Database.insert() method with the allOrNone parameter set to false allows for partial success.
If some records in the list fail due to validation rules, triggers, or other errors, the method will still attempt to insert the remaining valid records.
The false parameter ensures that records that fail will not roll back the transaction for the others.
Why not the other options?
A). Database.insert(records, true):
The true parameter makes the operation transactional (all or none). If any record fails, all records will roll back.
B). insert records:
The insert DML statement behaves like Database.insert(records, true) by default and rolls back all records if any error occurs.
C). insert(records, false):
This syntax is invalid in Apex.
References:
Apex DML Operations Documentation
Database Methods