Definition of parallel and sequential execution

Given two functions that call a suspend function. Determine which of them have calls happening simultaneously and which have calls happening one after another.

fun sum(): Int {
    val first = async { suspendFun() }.await()
    val second = async { suspendFun() }.await()
    return first + second
}

fun sum2(): Int {
    val first = async { suspendFun() }
    val second = async { suspendFun() }
    return first.await() + second.await()
}

fun suspendFun(): Int {
    longBackgroundWork()
}