A developer is testing a prototype on Amazon EC$2.$ The instances are terminated afterWhat role do security groups play in managing access to Amazon EC$2$ instances?

Security groups provide a set of rules to control traffic to or from an instance.

Security groups define the AWS Identity and Access Management $($IAM$)$ roles that

can access an instance.

Security groups control inbound access to the subnet that an Amazon EC$2$ is

associated with.

Security groups identify the public and private keys required to connect to an

Amazon EC$2$ instance.

testing, but the application requires uninterrupted compute while processing. Which

type of Amazon EC$2$ instance pricing meets the need at the lowest cost?

Scheduled Reserved Instance

Spot Instance

Reserved Instance

On$-$Demand Instance