I think that
can is OK; it's vague enough either way. Maybe it will never happen on a particular JVM; maybe it will always happen on another JVM; either way, "can" is appropriate, IMO.
There's another problem with this questin which I consider more serious:
Given a reference called t to a class which extends Thread, which of the following will cause it to give up cycles to allow another thread to execute.
What's "it"? The thread represented by t seems most likely though that's not definite. The problem is, ifyou call t.yeild(), that isn't likely to have any effct on t at all -
unless t just happens to also be the currently executing thread. I think that this is the sort of thing that the real exam might actually
test you on - whether or not you know that yield() is static and therefore most likely has no effect on t. And the question is extremely ambiguous in this regard. The answer is less ambiguous, except that it does say that option 1 is correct - and in many cases, it's not. I suppose that if we add the
word "can" as previously suggested, that might be vague enough to allow option 1 to be correct. But that's still misleading. The most likely scenario is that option 1 will have no effect at all on t.