When writing a Lambda function, what is the benefit of instantiating AWS clients outside the scope of the handler?

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When writing a Lambda function, what is the benefit of instantiating AWS clients outside the scope of the handler?
A . Legibility and stylistic convention
B . Taking advantage of connection re-use
C . Better error handling
D . Creating a new instance per invocation

Answer: B

Explanation:

Reference: https://www.jeremydaly.com/reuse-database-connections-aws-lambda/