True Postcondition, with true Precondition
A true postcondition means there is no restriction on outputs.

Think about it. The condition x &gt; 5 means: it's true (anything goes), as long as x is greater than 5. The only way for that condition to be invalidated is when x isn't greater than 5. The condition true means: x doesn't even need to be greater than 5. There is no way to invalidate that condition at all. Anything goes.

(If you don't mind, I'll leave the rest to you.)