Why is ulnar pulse difficult to feel?

hello everyone, I had a question on some of my homework that I was trying to find the answer to. The question is "why can the ulnar pulse not usually be felt?"

I think the answer is that the radial pulse is taken because it is closer to the skin, while the ulnar artery is farther below the skin, making it harder to feel. I just wanted to make sure this was right.

Thanks in advance,

Kaan