A 10-year prospective cohort study follows 1,000 adults without diabetes at baseline to assess the effect of high-sugar diets on the incidence of type 2 diabetes mellitus (T2DM). Among 500 participants who consume a high-sugar diet, 50 develop T2DM during the follow-up period. Among 500 participants who consume a low-sugar diet, 25 develop T2DM. Which of the following best represents the relative risk (RR) of developing T2DM in the high-sugar group compared with the low-sugar group, and how should this RR be interpreted?