Which of the following is the correct output for the following JavaScript code?

1. A) 1
2. B) true
3. C) undefined
4. D) 0

<script>
 let myStr; 
 console.log(myStr);
</script>

If you run the above code, the output will be "undefined", which is option C) in the multiple choice question.

Explanation: The variable myStr is declared but not initialized, so its value is undefined.