Can you name interfaces used for implementing deferred or asynchronous task execution?

In C#, the following interfaces are often used to implement deferred or asynchronous task execution:

• IAsyncResult — an older interface used in asynchronous programming before the advent of async/await.
• Task and Task<TResult> — not interfaces, but classes that implement the IAsyncResult interface and are used to represent asynchronous operations.
• IAsyncEnumerable<T> — an interface for asynchronous iteration, allowing elements to be received as they become available.
• IProgress<T> — an interface for reporting the progress of asynchronous operations.

The main modern approach is to use Task along with the keywords async and await, but interfaces help build more flexible and extensible solutions.