The pie chart below depicts the beverage size customers choose while at a fast food restaurant. Complete parts ​(a) through ​(c). A pie chart titled "Most popular beverage sizes at a restaurant" contains four sectors, each labeled with a beverage size and a percentage as follows: XL, 21%; Small, 13%; Medium, 60%; Large, 6%. The sectors’ relative sizes correspond with the percentage labels. Most popular beverage sizes at a restaurant XL 21% Small 13% Medium 60% Large 6% ​(a) What is the most popular​ size? What percentage of customers choose this​ size?