It requires `x < y` and `y <= z`, with one evaluation of `y`.✓Правильный ответ
It is invalid syntax because comparisons cannot be chained.
Объяснение
The chain requires both neighboring comparisons to hold and evaluates the middle expression only once. Comparing `x` directly with `z` for the second test changes the meaning, while writing two separate comparisons can reevaluate `y`.