When elements within a container overlap, the z-index property can be used to indicate how those items are stacked on top of each other. Which set of statements is true?

1. 1. Larger z-index values appear on top elements with a lower z-index value.
   2. Negative and positive number can be used.
   3. z-index can be used only on positioned elements.

2. 1. Smaller z-index values appear on top of elements with a larger z-index value.
   2. Negative and positive numbers can be used.
   3. z-index can be used with or without positioned elements.

3. 1. Smaller z-index values appear on top of elements with a larger z-index value.
   2. Negative and positive number can be used.
   3. z-index must also be used with positioned elements.

4. 1. Larger z-index values appear on top of elements with a lower z-index value.
   2. Only positive number can be used.
   3. z-index must also be used with positioned elements.

Correct Answer:

• 1. Larger z-index values appear on top elements with a lower z-index value.
  2. Negative and positive number can be used.
  3. z-index can be used only on positioned elements.