In JavaScript, what is the purpose of the typeof operator?OptionsTo check if a variable is definedTo determine the type of a value or expressionTo convert a string to a numberTo create a new object

What data type does typeof null return in JavaScript?

What is the output of typeof null in JavaScript?Options"string""object""null""undefined"

How can you check if a variable is an array in JavaScript?OptionsUsing the Array.isArray() methodUsing the isarray() functionUsing the isArray() methodUsing the typeof operator

What is the purpose of the JavaScript Symbol data type?OptionsTo define custom data typesTo store binary dataTo represent unique values that can be used as object property keysTo create mathematical symbols

What does the typeof operator return for an array?A. objectB. listC. collectionD. array