A developer initializes the AWS SDK outside of an AWS Lambda handler function (for example, as a global variable). What is the PRIMARY advantage of doing this?

Initializing the AWS SDK outside the Lambda handler function allows the SDK client to be reused across subsequent invocations of the same Lambda function. AWS Lambda reuses execution environments for a period of time, and objects initialized globally persist between invocations. This significantly reduces the overhead of creating a new SDK client for each invocation, leading to improved performance and reduced latency, especially for frequently invoked functions. While it might incidentally improve readability for some, that's not its primary advantage. It does not inherently improve error handling; error handling mechanisms remain the same regardless of initialization location. Finally, it explicitly prevents the creation of a fresh SDK instance for every invocation, which is the opposite of its intended effect and benefit.