If a small fire initially breaks out i

If a small fire initially breaks out in the engine room bilges, in which of the following sequences should the fire extinguishing agents or systems be used?（）

• AFixed CO2,semi-portable CO2, then hand portable CO2
• BSemi-portable CO2, fixedCO2, then hand portable CO2
• CHand portable, semi-portable CO2, then as a last resort the fixed CO2 system
• DHand portable, fixed CO2, then as a last resort the semi-portable CO2