Answer: Store the video archives in Amazon S3 Glacier and use Expedited retrievals.

## Explanation The correct answer is **A. Store the video archives in Amazon S3 Glacier and use Expedited retrievals.** Here's why: ### Key Requirements Analysis: 1. **Minimize costs** - Primary requirement 2. **Rarely need to restore files** - Infrequent access pattern 3. **Maximum 5-minute retrieval time** - Time-sensitive when needed ### Storage Option Comparison: **Amazon S3 Glacier** (Options A & B): - **Lowest storage cost** among all S3 storage classes - Designed for long-term archival and infrequent access - Perfect for "rarely needed" video archives **S3 Standard-IA** (Option C): - Higher storage cost than Glacier - Designed for infrequent access but not archival - Faster retrieval but more expensive storage **S3 One Zone-IA** (Option D): - Lower cost than Standard-IA but higher than Glacier - Data stored in only one Availability Zone (higher risk) - Not suitable for valuable archival footage ### Retrieval Options for Glacier: **Expedited retrievals** (Option A): - Retrieval time: 1-5 minutes - Meets the "maximum of five minutes" requirement - Higher retrieval cost but acceptable for rare retrievals **Standard retrievals** (Option B): - Retrieval time: 3-5 hours - **Does NOT meet** the 5-minute requirement - Lower retrieval cost but violates time constraint ### Cost Optimization Strategy: Since the company "will rarely need to restore these files," the primary cost driver is **storage cost**, not retrieval cost. S3 Glacier has the lowest storage cost, and Expedited retrievals ensure the 5-minute requirement is met when needed. ### Why Not Other Options: - **Option B**: Standard retrievals take 3-5 hours, violating the 5-minute requirement - **Option C**: S3 Standard-IA has higher storage costs than Glacier - **Option D**: S3 One Zone-IA has higher storage costs than Glacier and stores data in only one AZ, which is risky for valuable archival footage ### Best Practice: For long-term archival with infrequent access and retrieval time requirements, S3 Glacier with Expedited retrievals provides the optimal balance of lowest storage costs while meeting the 5-minute retrieval SLA when needed.

Author: LeetQuiz Editorial Team