Statement (A) is incorrect. In the symbol of a transistor, the arrowhead in the emitter does not indicate the direction of flow of electrons; instead, it represents the direction of conventional current flow, which is from the base to the emitter. Electrons actually flow from the emitter to the base in an NPN transistor.

Statement (B) is correct. Transistors can be used as switches when operated in either the cutoff state (fully off) or saturation state (fully on). In the cutoff state, the transistor does not allow current to flow between the collector and emitter, acting as an open switch. In the saturation state, it permits a maximum current flow, acting as a closed switch. This switching behavior is commonly utilized in digital logic circuits and other applications.