Why is Wheatstone bridge needed?

Select one alternative:

the Wheatstone bridge is needed to transform the change of electrical resistance of

individual resistors that form the bridge, into the change of voltage (measured between

two points in Wheatstone bridge)

the Wheatstone bridge is needed to transform the change of electrical resistance of

individual resistors that form the bridge, into the change of inductivity (measured

between two points in Wheatstone bridge)

the Wheatstone bridge is needed to transform the change of capacitance measured at

individual resistors that form the bridge, into the change of voltage (measured between

two points in Wheatstone bridge)

the Wheatstone bridge is needed to transform the change of electrical resistance of

individual resistors that form the bridge, into the change of capacitance (measured

between two points in Wheatstone bridge)