Deep Archive has three retrieval speeds: Standard (approximately 0.02 USD per GB, 12 hours), Bulk (approximately 0.0025 USD per GB, up to 48 hours), and there is no Expedited tier for Deep Archive. For 50 TB at Bulk pricing, the retrieval fee lands around 125 USD plus per-request fees, which is why Bulk is the preferred restore mode when the SLA tolerates 48 hours. The restore copies the data into a destination class that you must specify; the source object stays in Deep Archive.

For six months of daily auditor queries, the correct destination is S3 Standard. Standard has no per-GB retrieval fee, while Standard-IA charges roughly 0.01 USD per GB on every retrieval. Multiplied by 50 TB and 180 days of daily access, Standard-IA retrieval fees would dwarf the roughly 2x higher per-GB storage price of Standard. The math flips only when access is rarer than about once a month, at which point Standard-IA wins. Glacier Instant at 0.03 USD per GB per retrieval is worse still, and Glacier Flexible violates the millisecond query expectation entirely.

Plain-Language Explanation:

Pulling a huge archive out of deep cold storage costs a few pennies per gigabyte once, but if you then stash it somewhere that charges a nickel every time you open the file, and you open it 180 times, you blow way past the archive fee. The trick is matching the destination class to the new daily access pattern, not the old archival one.

Option Analysis:1431

A：Correct because Bulk Deep Archive retrieval is roughly 0.0025 USD per GB, and daily auditor queries for 6 months make Standard cheaper than Standard-IA after retrieval fees are multiplied out.
B：Wrong because there is no such free retrieval allowance for Deep Archive Standard retrieval, and Standard-IA retrieval fees would exceed storage savings at daily access.
C：Wrong because retrieval is billed per GB not per TB-egress, and Glacier Instant's retrieval fee for daily access for 6 months is prohibitive.
D：Wrong because there is no 100 USD cap, and Glacier Flexible cannot serve millisecond auditor queries.