Concept:A resistor that always maintains the same resistance is known as a fixed resistor or standard resistor.
Explanation:In physics, a standard resistor is specially designed to have a precise, constant resistance value.
This value does not change with normal use, which makes it suitable for calibration and reference purposes.
A resistance box contains multiple fixed coils but is not the resistor itself.
A shunt resistor is connected in parallel to divert current.
A multiplier resistor is connected in series with a galvanometer to extend its voltage range.
Only a standard resistor is simply called a resistor with a fixed resistance value.
Answer:B. standard resistor