Which method is used to select an HTML element by its ID using JavaScript?

The method used to select an HTML element by its ID in JavaScript is document.getElementById(). This function is part of the Document Object Model (DOM) API, and it allows you to retrieve an element from the HTML document based on the unique ID attribute assigned to that element.

When you call document.getElementById('someId'), it searches the HTML document for the element with the specified ID and returns a reference to that single element. This method is particularly useful because IDs should be unique within a document, making it easy to access specific elements directly.

The other choices do not represent valid methods or are not part of the standard JavaScript functionality for selecting elements by ID, which is why they're not correct.