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You have completed Comprehensive Overview of JavaScript Syntax: Case Sensitivity, Whitespaces, Comments, Semicolons, Literals, and Identifiers Quiz!
Quiz Question 1 of 5
Consider the following identifiers in a JavaScript program:
let $user;
let _User;
let user1;
let 2User;
Which of the following is the best reason why 2User is considered an invalid identifier?
Choose the correct answer below: