Figure RST is reflected about the y-axis to obtain figure R’S’T’: Which statement best describes the relationship between the two figures?

1 - Figure RST is bigger than figure R’S’T’.

2 - Figure RST is congruent to figure R'S'T'.

3 - The measure of angle R is equal to the measure of angle S’.

4 - The measure of angle R is equal to the measure of angle T’.