The even numbers on a regular 10-sided die (which has faces numbered from 1 to 10) are {2, 4, 6, 8, 10}. However, the event of rolling an even number less than 5 includes only the even numbers that meet this criteria.
The even numbers less than 5 are:
- 2
- 4
Therefore, the correct response is:
{2, 4}