Which of the following is a suitable method to prevent variable leakage in the global scope?

Using the var keyword to declare variables.
Using immediately-invoked function expressions (IIFE).
Using global variables exclusively.
Using let and const keywords to declare variables.

Using immediately-invoked function expressions (IIFE) is a common technique to prevent variable leakage into the global scope. It encapsulates variables within a function scope, avoiding global pollution. The other options do not address this concern effectively.

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