Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?

Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect? Correct Answer var strict = (function() { return !this; }());

The above code defines and invokes a function to determine if we’re in strict mode.
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