Optiver - Is That a Market Making Role?

I'd love to talk a little bit about what you were doing at Optiver. You mentioned that you were on the Treasury options desk. Now, was that like a market making role or like a prop trading role? That was the market making. Most of time our profit and losses comes from two venues. The first is flow. So that means the bid and ask spread, which I to be in the middle. And then there are priority positions we take.That's the two main sources of income that basically all options trading desk that I have.