"Are you sure you did not see her?"
What should be the ideal response from below choices :
"Yes, if I saw her, I would remember it."
"Yes, if I had seen her, I would remember it."
"Yes, if I had seen her, I would have remembered it."
I think second one is correct but all other options are not looking wrong too.
Some context: My boss's secretory has not come and he is asking me if I had seen her. I think its fairly obvious what I intend to answer,but all the three option are looking similar.So point out the subtle difference to me, if any.