What is the recommended ratio of anchor rode length (calibre/longitud de cabo y cadena) to water depth when anchoring in a sheltered bay under normal conditions?

1. At least 3:1 to 5:1 (rode length equal to 3 to 5 times the water depth)
2. Exactly 1:1 (rode length equal to the water depth)
3. 0.5:1 (rode length half the water depth)
4. 20:1 under calm weather with no wind