When checking the temperature of your facility's vaccine storage unit, you discover that the current temperature is outside of the recommended temperature range in the vaccine package insert(s). Which of the following actions should you take upon discovering the temperature excursion?
a) Wait four hours to see if the temperature returns to the normal range
b) Record the temperature on the temperature log and take no further action
c) Call your immunization program for guidance
d) Immediately discard the vaccine