Which of the following property is used to define how nested items are rendered in a 3-D space, the choice being either flattened or with their dimensions preserved?

The correct answer is D. transform-style.

The transform-style property is used to define how nested items are rendered in a 3-D space, the choice being either flattened or with their dimensions preserved.

The other options are not correct because:

• A. transition-duration is a CSS property that specifies the duration of a transition effect.
• B. transition-delay is a CSS property that specifies the delay before a transition effect begins.
• C. transition is a CSS property that specifies how an element changes from one state to another.

I hope this helps! Let me know if you have any other questions.