What should be ensured about bodies in receiving vaults?

When considering the appropriate care for bodies placed in receiving vaults, it's important to recognize the importance of preservation through proper embalming. Proper embalming is a critical practice that helps to delay the natural decomposition process, ensuring that the body retains its appearance and condition for a longer period while it is stored in a receiving vault. This is particularly vital in situations where immediate burial may not be feasible due to factors such as weather conditions, scheduling issues, or logistical concerns.

The other options suggest alternative practices, such as refrigeration or immediate interment, which may not always be applicable or necessary given the specific circumstances surrounding each case. The emphasis on embalming ensures that the body is treated with respect and care, maintaining its integrity until arrangements for final disposition can be completed.