Which keyword is used to declare variables in JavaScript that cannot be reassigned?

Which of the following is not a valid way to declare a JavaScript variable?Optionsvar x;const x;variable x;let x;

How can you prevent a JavaScript variable from being modified after its initial assignment?OptionsUse the final keywordUse the let keywordUse the const keywordUse the var keyword

Which of the following is the correct way to declare a variable in JavaScript?variable name = "John";var name = "John";let name == "John";name: "John";

What is the correct syntax to declare a variable in JavaScript?var myVariable;variable myVariable;Both a and clet myVariable;

Which of the following is a valid way to declare an object in JavaScript?