Base units
The correct answer is Base units.
Fundamental physical quantities are the basic quantities that cannot be expressed in terms of other quantities. They are the building blocks upon which all other measurements are based. These fundamental quantities are measured using base units. Examples of base units in the International System of Units (SI) include the meter (m) for length, the kilogram (kg) for mass, the second (s) for time, and the ampere (A) for electric current.
Derived units, on the other hand, are combinations of base units used to measure derived quantities. For example, the unit of speed (meter per second, m/s) is a derived unit because it is a combination of the base units for length (meter) and time (second).
Therefore, only base units are used to measure fundamental physical quantities.
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