Boiler mountings are a set of safety device installed for the safe operation of a boiler.

There are seven main mountings on a boiler shell:

• safety valve,
• steam stop valve,
• vent valve,
• pressure gauge,
• water level indicator,
• feed check valve and
• fusible plug.

Some important boiler accessories are:

• Feed water pump,
• injector,
• pressure reducing valve,
• economizer,
• air pre heater,
• super-heater,
• steam drier or separator and
• steam trap.

Hence, the correct option is (B).