Which of these methods can be used to select an HTML element by its ID in JavaScript?

The method getElementById is specifically designed to select a single HTML element by its ID attribute in the document. This method is part of the Document Object Model (DOM) API and allows you to retrieve an element efficiently by providing the exact ID of the element you want to access. It returns the first element with the specified ID, which is particularly useful when you know that IDs must be unique within an HTML document.

While querySelector is also capable of selecting elements, it uses CSS selectors to select elements and can be used for a broader range of selections. However, the most direct and efficient way to select an element by its ID is by using getElementById.

The options selectById and findElementById do not exist in the JavaScript API and therefore cannot be used to access elements, reinforcing that the correct choice is indeed getElementById.