Is it possible to continue with task C after A and B run to completion without fault or cancellation using a single TPL method?

I've tried to use Task.Factory.ContinueWhenAll() a few times now with the intent of invoking a continuation only when all the antecedents run to completion without any errors or cancellations. Doing so causes an ArgumentOutOfRangeException to be thrown with the message,

It is invalid to exclude specific continuation kinds for continuations off of multiple tasks. Parameter name: continuationOptions

For example, the code

var first = Task.Factory.StartNew<MyResult>(
    DoSomething,
    firstInfo,
    tokenSource.Token);
var second = Task.Factory.StartNew<MyResult>(
    DoSomethingElse,
    mystate,
    tokenSource.Token);
var third = Task.Factory.ContinueWhenAll(
    new[] { first, second },
    DoSomethingNowThatFirstAndSecondAreDone,
    tokenSource.Token,
    TaskContinuationOptions.OnlyOnRanToCompletion, // not allowed!
    TaskScheduler.FromCurrentSynchronizationContext());

is not acceptable to the TPL. Is there a way to do something like this using some other TPL method?