You areadministering a database that supports an OLTP workload. The default UNDO tablespace is a fixed size tablespace with the RETENTION NOGUARATNEE clause and undo retention set to 12 minutes. The…

The ORA-01555 'snapshot too old' error occurs when a long-running query cannot reconstruct a consistent view of data because the required undo information, which allows a block to be read as it was at the query's start time, has been overwritten or aged out from the undo tablespace, especially with `RETENTION NOGUARANTEE` and an undo retention period shorter than the query duration.

The ORA-01555 error signifies an issue with reading old versions of data due to missing undo, not an inability to write new data blocks into the undo tablespace.

Flashback Data Archive (FDA) provides long-term historical data, but it does not directly manage the undo segments necessary for read consistency of current transactions which cause ORA-01555.

The Fast Recovery Area (FRA) stores backups, archived redo logs, and flashback logs, but it is not used for storing the undo segments that are critical for achieving read consistency during active transactions.

This choice is a duplicate of option A, and since only one answer is marked correct, A is the intended specific correct reason.