Mars (https://www.mars.com/) has hired you into its human-centred design team for its Pedigree brand. Your new colleagues have data that indicates the average weight of dogs is increasing. They want to know why. They hypothesize that the cause is a lack of exercise. Which of the following types of observations would be the most appropriate to collect insightful data to test this hypothesis? 1) All of the other answers would provide insightful observations to test the hypothesis 2) Watch dogs when they are let off the leash outside 3) Watch dogs and their owners when they go for walks 4) Watch what dogs do for a whole day 5) Watch dogs at meal times