According to Florida law, children under 6 years of age must wear a Type I, II, or III USCG-approved life jacket/personal flotation device (PFD) at all times during which activity?

A. traveling on a vessel going faster than 25 miles per hour
B. cruising on any vessel less than 26 feet in length
C. riding on the bow of a vessel
D. swimming in a marked swimming area