Question from the Object-oriented programming - Fundamentals test

The casting (implicit or explicit) to a parent type (upcasting) is always accepted by the compilator and it will not produce errors during the execution.

The implicit casting to a child type (downcasting) is never accepted by the compilator.

The explicit casting to a child (downcasting) is always accepted by the compilator and it will not produce errors during the execution.

The explicit casting to a child (downcasting) is always accepted by the compilator but it may produce errors during the execution.