Figure XYZ is reflected about the y-axis to obtain figure X’Y’Z’:

A coordinate plane is shown Triangle XYZ has vertices X at 5 comma negative 4, vertex Y at 2 comma negative 4, and Z at 4 comma negative 1. Triangle X prime Y prime Z prime has vertices at X prime negative 5 comma negative 4, Y prime at negative 2 comma negative 4, and Z prime at negative 4 comma negative 1.

Which statement best describes the relationship between the two figures?

Figure XYZ is bigger than figure X’Y’Z’.
Figure XYZ is congruent to figure X’Y’Z’.
The measure of angle R is equal to the measure of angle S’.
The measure of angle R is equal to the measure of angle T’.