Question

Sonia constructed triangle ABC as shown in the figure below.



The following are some of the steps she took while constructing a triangle congruent to triangle ABC.

Step 1: With the compass on A set the width to side AC.
Step 2: With the compass on A set the width to side AB
Step 3: With the compass on A draw an arc to cut side AC at X and side AB at Y. Place the compass on X and set the width to segment XY.

Which congruency postulate did Sonia likely have in mind while constructing the congruent triangle?