Sister Rebecca arrives at the clinic at 6H45 on Tuesday, which is always her busiest day of the week, and discovers that there has been a power failure. When she left the clinic on Monday at 16H00, the electricity was on. She checks the mains, and sees that there has not been a trip, so she calls the municipality. She is told that a sub-station failure occurred at around 02H00, and power should be restored by 11H00. But she is very worried, since the refrigerator she is using for storing vaccines is an old domestic refrigerator, and the last time there was a power failure, the refrigerator would not work after power was restored, and it took 3 weeks to get it repaired. During that time, she had to refer all her clients needing vaccinations to the nearest health facility, 50 km away. The electrician had warned her that if there are fluctuations in the power supply, the refrigerator is highly likely to stop working again. She had ordered a new refrigerator at the time, but unfortunately it has not yet been delivered.

QUESTION: The power comes back on at 11H00, and as Sister Rebecca feared, the old domestic refrigerator is NOT working. However, a miracle has happened, as the new refrigerator arrived just after 08H00 and is fully installed by the time the power is restored! Although the new refrigerator is smaller, Sister Rebecca is very grateful. When transferring the vaccines to the new refrigerator, consider the following statements:
A. All the stock that is due to expire first must be placed in the door of the fridge, so that they can be used first.
B. Because space in the new refrigerator is limited, all the vaccines that are not freeze-sensitive, can be stored in the freezing compartment.
C. The inner square of all vaccine vial monitors must be a lighter colour as compared to the surrounding circle, which means that the vaccines are still safe to use.
D. Measles and OPV are least sensitive to heat and should therefore be placed on the bottom shelf of the refrigerator.