In Express.js, the all() method is used to handle all HTTP methods (GET, POST, PUT, DELETE, etc.) for a specific route. It is equivalent in functionality to the any() method. The use() and match() methods do not provide the same functionality.

The Event Loop in Node.js handles asynchronous tasks by adding them to a queue and executing them in a non-blocking manner. It ensures that asynchronous tasks are processed in the background without pausing the main thread, allowing Node.js to remain responsive. The other options do not accurately describe how asynchronous tasks are handled by the Event Loop.

In Express.js, the :id? in a route path like "/users/:id?" denotes that id is an optional parameter. This means that the id parameter may or may not be present in the URL, and the route will still match. The other options are not correct in this context (required would mean the parameter is mandatory, query is used for query parameters, and body is used for request bodies).

To serve static files such as images, CSS files, and JavaScript files, a special folder called the public folder is commonly used in Express.js. This folder typically contains all your publicly accessible static assets.

In Node.js, the global object is a global context object that contains various properties and methods available throughout the application. globalThis is a reference to the global object, which allows cross-environment compatibility. console, module, and require are not properties of the global object but are commonly used in Node.js for various purposes.

The primary difference is that OAuth 1.0 requires client registration, while OAuth 2.0 does not. OAuth 2.0 introduced a more streamlined and flexible approach to authorization. The other options describe differences but not the primary distinction.