Answer:
All of the options applies
Step-by-step explanation:
Dive computers can be used to check diver's no stop times which is the time spent at a given depth, therefore option A is applicable to calculate how long they have to remain at the surface to have enough no stop time
dive computers are equipped planning mode called simulation to calculate remaining surface interval with the depth of the dive. therefore option B is applicable to calculate how long they have to remain at the surface to have enough no stop time.
Also different dive planning apps could be used, as well as Recreational Dive Planner (RDP) Table