12. In an outbreak investigation, the attack rate for eating vanilla ice cream is 69.6%, while the attack rate for those who ate potato salad is 94.3%. RR were calculated to examine an association between the particular exposure of interest (vanilla ice cream or potato salad) and the risk of disease. The RR for eating ice cream was 1.42 (p-value = 0.054), while the RR for eating potato salad was 6.73 (p-value = 0.001). Which food is the most likely source of the outbreak?