The International System of Units (SI) is the modern form of the metric system. There are seven fundamental units in the SI system, forming the base upon which all other units are derived. These base units are:
- Length: meter (m)
- Mass: kilogram (kg)
- Time: second (s)
- Electric Current: ampere (A)
- Thermodynamic Temperature: kelvin (K)
- Amount of Substance: mole (mol)
- Luminous Intensity: candela (cd)
Therefore, the correct answer is 7.
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