Let's look at the code JOIN MERGEJOIN (inputs presorted) [Cost: 750, Rows: 1200] (PATH ID:1). What does the number 750 represent? A. The total cost of sales items in this joined dataset The exact known cost of the query runtime C. The estim

Let's look at the code JOIN MERGEJOIN (inputs presorted) [Cost: 750, Rows: 1200] (PATH ID:1). What does the number 750 represent? A. The total cost of sales items in this joined dataset The exact known cost of the query runtime C. The estimation cost