The correct answer is: A. Subsidiary
A shunt signal is a subsidiary signal that is used to provide additional information to the main signal. It is typically used to indicate the presence of a fault or to provide information about the status of a system.
A subsidiary signal is a signal that is used to provide additional information to the main signal. It is typically used to indicate the presence of a fault or to provide information about the status of a system. Subsidiary signals are often used in conjunction with main signals to provide a more complete picture of the system’s status.
An ordinary signal is a signal that is used to convey information. It is typically used to indicate the presence of a condition or to provide information about the status of a system. Ordinary signals are often used in conjunction with other signals to provide a more complete picture of the system’s status.
Both subsidiary and ordinary signals are important for providing information about the status of a system. However, subsidiary signals are typically used to provide additional information, while ordinary signals are typically used to convey information.