C - Welding method selection area
C1 - DC MIG mode indicator lamp
C2 - DC MMA mode indicator lamp
C3 - Welding method selection button
D - Welding wire type selection area
D1 - Welding wire type selection button
D2 - Solid carbon steel wire
D3 - Steel cored wire
D4 - Stainless steel solid wire
E - Protective gas selection area