A company stores monthly financial reports that are rarely accessed but must remain instantly retrievable and highly durable across multiple AZs. Which S3 storage class minimizes cost while meeting these needs?
A) S3 Standard.
B) S3 Standard-Infrequent Access (Standard-IA).
C) S3 One Zone-IA.
D) S3 Glacier Flexible Retrieval.
Correct Answer: B
Explanation: S3 Standard-IA offers lower storage cost than Standard for infrequently accessed data while keeping millisecond retrieval and multi-AZ durability. (A) costs more for rarely-accessed data. (C) One Zone-IA stores in a single AZ, reducing durability. (D) Glacier introduces retrieval delay, failing “instantly retrievable”.