Question: What is not a valid way of declaring a padding value of 10 pixels on the top and bottom, and 0 pixels on the left and right?

1. padding: 10px 10px 0px 0px;
2. padding: 10px 0px;
3. padding: 10px 0;
4. padding: 10px 0px 10px 0px;

Answer: The correct answer of the above question is Option A:padding: 10px 10px 0px 0px;