Instrument transformers, shunts, and multipliers are all used in electrical systems for measurement and protection purposes. However, they have different characteristics and applications. The correct answer is option 'C' - readings are independent of component values. Let's explore the differences between these devices:

Instrument Transformers:
- Instrument transformers are used to measure high voltages and currents accurately. They are commonly used in power systems for measurement, control, and protection purposes.
- These transformers step down high currents or voltages to a level that can be safely measured by instruments like ammeters, voltmeters, wattmeters, etc.
- Instrument transformers include current transformers (CTs) and potential transformers (PTs). CTs are used to measure high currents, while PTs are used to measure high voltages.
- The primary winding of an instrument transformer is connected in series with the circuit carrying the high current or voltage, while the secondary winding is connected to the measuring instrument.
- The turns ratio of the transformer allows for accurate measurement and scaling of the current or voltage.

Shunts:
- Shunts are low resistance devices used in parallel with a load to measure the current flowing through it.
- They are commonly used in ammeters to measure high currents directly.
- Shunts have a known resistance value, and the current passing through the shunt can be calculated using Ohm's Law.
- The voltage drop across the shunt is proportional to the current flowing through it, allowing for accurate current measurement.

Multipliers:
- Multipliers, also known as voltage multipliers or potential dividers, are used to increase or decrease the voltage level in a circuit.
- They consist of resistors connected in series or parallel to achieve the desired voltage scaling.
- Multipliers are commonly used in voltage measurement circuits to scale down high voltages to a level that can be safely measured by instruments.
- They can also be used to increase the voltage level in certain applications.

Readings are independent of component values:
- Unlike shunts and multipliers, instrument transformers provide accurate measurements independent of the component values.
- The turns ratio of an instrument transformer is carefully designed and calibrated to ensure accurate measurement.
- The primary and secondary windings of instrument transformers are carefully constructed to minimize losses and maintain a high degree of accuracy.
- Instrument transformers are calibrated and tested to meet specific accuracy standards, ensuring reliable and consistent readings.

In conclusion, instrument transformers, shunts, and multipliers have different functions and applications. While instrument transformers provide accurate measurements independent of component values, shunts are used for direct current measurement, and multipliers are used for voltage scaling.