When discharging the first fire extinguisher bottle into an engine and the EICAS warning message FIRE ENG 1, 2, 3, 4 remains, how long should you wait before discharging the second fire extinguisher bottle into the engine?

A、No wait is required, fire the second bottle if the message remains.
B、Wait 20 seconds and fire the second bottle if the message remains.
C、Wait 30 seconds and fire the second fire extinguishing bottle if the message remains.
D、Wait 1 minute and fire the second fire extinguishing bottle if the message remains.