Final answer:
Regulators that creep excessively or beyond the safe working pressure should be stopped immediate and repaired before using them again.
Step-by-step explanation:
If a regulator is creeping excessively or beyond the safe working pressure, it is important to take appropriate action to ensure safety. Continuing to use them without any precautions (option 1) can lead to equipment failure or accidents. It is best to stop using them immediately (option 2) and have them repaired before using them again (option 4). In the meantime, if immediate repair is not possible, they can be used with caution until they are repaired (option 3). However, this should only be a temporary measure until proper repair can be done.