a sandwich stand sells sandwiches with different choices of stuffing. THe set choices for each category are: Filling choices: $=\{$chicken$,$ beef, fish$\}$ Bread choices: $\{$white$,$ wholewheat$\}$ Sauce choices: $=\{$mild$,$ medium, hot$\}$ If every sandwich has a bread, filling and sauce then how many possible sauce combinations are there? computer science