【名词&注释】
持之以恒(perseveration)、专用工具(special tool)、流水账(running account)、生产经营活动的
[单选题]An undocumented vessel with 10 people aboard and operating 25 miles off the seacoast must carry a survival craft of the().
A. inflatable buoyant apparatus type
B. buoyant apparatus type
C. life float type
D. Any of the above types are acceptable