What should the solutions architect recommend to meet these requirements?
Enable termination protection for the EC2 instance.
Configure the EC2 instance for Multi-AZ deployment.
Create an Amazon CloudWatch alarm to recover the EC2 instance in case of failure.
Launch the EC2 instance with two Amazon Elastic Block Store (Amazon EBS) volumes that use RAID configurations for storage redundancy.
Explanations:
Enabling termination protection prevents the instance from being accidentally terminated but does not provide any resilience or recovery mechanism in case of a failure. It does not improve recovery time.
Multi-AZ deployments are not applicable for EC2 instances running single instances of legacy applications. Multi-AZ typically applies to services like Amazon RDS. This option does not meet the requirement of running the application on only one instance.
Configuring an Amazon CloudWatch alarm to recover the EC2 instance in case of failure allows for automated recovery of the instance, significantly improving recovery time. If the instance goes down, CloudWatch can trigger a restart, thus enhancing availability.
While using RAID configurations for storage redundancy can improve data availability and durability, it does not improve the recovery time of the EC2 instance itself in case of a failure, as the instance is still running a single copy of the application.
I surmise that the answer is:
Create an Amazon CloudWatch alarm to recover the EC2 instance in case of failure.