I'm lost too!
Let's first settle on the underlying, which one is it:
- S&P 500 cash index (SPX),
- S&P 500 futures (SP),
- S&P 500 e-mini futures (ES),or
- S&P 500 exchange-traded fund (SPY)!?
Each and every one of them has options, which are NOT fungible.
Edit: By the way, we also...