help please! the question is in the picture below for reference when answering! thank you so much!

Answer:
(a, 0) I give 50% credit to the answer in the comments
Step-by-step explanation:
Because it is isosceles, we must have the same y distance, (a) as an x distance
So we must have (a) in the x coordinate
The correct option is number 2
If my answer is incorrect, pls correct me!
If you like my answer and explanation, mark me as brainliest!
-Chetan K