Which of the following can be classified as suspend functions?

In Kotlin, suspend functions are special kinds of functions that have the ability to pause and resume execution, allowing them to work seamlessly with coroutines. To classify a function as a suspend function, it typically needs to be explicitly declared with the suspend keyword.

The lambda passed into the async function can indeed qualify as a suspend function if it is indeed defined in a coroutine context. When you define a lambda as a suspending function and pass it to async, it operates as a coroutine builder. This means it can call other suspend functions and interact with suspend structures within that lambda. Therefore, within the context of coroutine programming in Kotlin, the lambda itself holds the potential of being a suspend function, provided the correct definitions and uses are in place.

On the other hand, async is a coroutine builder and does not itself primarily represent a suspend function—rather, it creates a coroutine to execute that lambda and return a deferred result. Similarly, runBlocking serves a different purpose; it blocks the current thread until the coroutine inside it is complete and is not classified as a suspend function. The lambda passed into runBlocking has the ability to call suspend functions, but it isn't inherently a suspend function itself.

Thus, the reason the lambda passed into async is