#Explanation:
* A: Cloud-based data mirroring offers near-real-time replication, keeping RPO near zero. This is essential for billing systems where even a small amount of data loss could be critical.
* B and D: Manual or local backups don't offer low RPO unless continuously synced.
* C: Snapshots are periodic and inherently result in a higher RPO due to the gap between intervals.

Let's calculate Total Cost of Ownership (TCO) for 24 months based on the table and given scaling requirements:
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Metro Ethernet:
* CAPEX = $45,000
* Installation Fee = $5,000
* OPEX = $125,000/year # $250,000 for 2 years
* Total = 45,000 + 5,000 + 250,000 = $300,000
DWDM:
* CAPEX = $250,000
* Installation Fee = $30,000
* OPEX = $100,000/year # $200,000 for 2 years
* Total = 250,000 + 30,000 + 200,000 = $480,000
CWDM:
* CAPEX = $150,000
* Installation Fee = $25,000
* OPEX = $100,000/year # $200,000 for 2 years
* Total = 150,000 + 25,000 + 200,000 = $375,000
MPLS:
* CAPEX = $50,000
* Installation Fee = $75,000
* OPEX = $150,000/year # $300,000 for 2 years
* Total = 50,000 + 75,000 + 300,000 = $425,000
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Metro Ethernet clearly results in the lowest total cost while meeting dual 10G and scalable growth to 20 connections due to its simple provisioning and operational flexibility.
This approach fully aligns with CCDE v3.1 business-driven cost modeling principles: balancing cost, scalability, and operational simplicity.
Why other options are incorrect:
* B, C, D: All are more expensive after full 2-year calculation for the required scale.
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#Explanation:
* C: Using a consistent data protection strategy (encryption at rest/in motion) across environments ensures policy continuity across private and hybrid clouds.
* E: Applying cryptographic protocols (e.g., TLS, IPsec) protects data as it traverses public and hybrid infrastructure.
Other options:
* A: Automation of security scanning is encouraged; avoiding it is counterproductive.
* B: While SSH is secure, it doesn't address full-stack hybrid data protection.