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                                            The + operator in javascript acts as a concatenation operator when used with string. The new string does not have any space between the two added strings.                                                

                                            A closure is a function that is enclosed with references to its lexical environment. A closure allows an inner function to access the scope of an outside function. Closures are formed every time a function is created in JavaScript, during function creation time.                                                

                                            Although JavaScript is not an OOP (Object-Oriented Programming) language like Java or PHP, it is object based language. The standard threesome of polymorphism, encapsulation, and inheritance are the criteria for object orientation, and JavaScript fails to meet them.                                                

                                            JavaScript is a scripting language used along with HTML and CSS to make the website interactive along. It is used both on the client-side and server-side.                                                

                                            Queries can be saved in a database, unlike filters that are used to temporarily sort, filter or modify data. Therefore, the correct option is (a) objects.                                                

                                            TCL (Transaction Control Language) statement. ROLLBACK is a TCL statement that is used to undo changes made in a transaction and to restore the database to its previous state before the transaction started. TCL statements are used to control the changes made by transactions in a database. The other TCL statements are COMMIT and SAVEPOINT.