How is a variable declared in JavaScript?

In JavaScript, a variable is declared using the keywords var, let, or const, followed by the variable name. Each of these keywords serves a specific purpose regarding the scope and mutability of the variable.

• var is used to declare variables that can have their values changed and have function scope or global scope, depending on where they are declared.

• let is introduced in ES6 and is used for variables that should have block scope, meaning they exist only within the nearest enclosing block, such as a for loop or an if statement.

• const is also introduced in ES6 and is used to declare variables that are meant to be constant, meaning that their value cannot be reassigned after they are set initially. However, it's important to note that for object references assigned to a const variable, the properties of the object can still be modified.

This method of variable declaration is a fundamental aspect of the language, enabling developers to control variable scope and enforce immutability when necessary. Options that suggest using variable name and type declaration or type hints do not align with JavaScript's dynamic typing system, where variable types are determined at runtime and no explicit type declaration is used. Similarly, the mention of reserved keywords