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Answer: Modify the existing instance to Multi-AZ deployment.
The correct answer is A: Modify the existing instance to Multi-AZ deployment. This approach converts the current Single-AZ DB instance to a Multi-AZ deployment, providing high availability and automatic failover support without requiring any changes to the application code. It minimizes downtime by ensuring that the database remains available even if one Availability Zone fails.
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How can a company minimize database downtime for an online shopping application using Amazon RDS for PostgreSQL without altering application code?
A
Modify the existing instance to Multi-AZ deployment.
B
Create a new Multi-AZ deployment from a snapshot of the current instance.
C
Establish a read-only replica in another AZ and balance requests with Route 53.
D
Implement the database in an EC2 Auto Scaling group and balance requests with Route 53.
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