A crewmember is being prepared to enter the water to assist a man overboard. According to 46 CFR §28.265, which combination of precautions is required before the crewmember enters the water?

1. A. Don an immersion suit only; no safety line is required if the rescue boat is already in the water
2. ✓ Don a lifejacket or immersion suit AND have a safety line attached before standing by to enter the waterCorrect
3. C. Don a lifejacket and carry a heaving line; a safety line is optional at the master's discretion
4. D. Don a lifejacket only; an immersion suit is not required unless water temperature is below 60°F