The Vaisheshika school of philosophy, founded by Sage Kanada, classifies all existing things into categories called 'Padarthas'. How many Padarthas are recognized in the classical Vaisheshika system, and what is their primary ontological purpose?

Options:

• A: Four categories, representing the four material elements (earth, water, fire, air) that constitute the universe.
• B: Nine categories, representing the nine planets (Navagrahas) that influence human destiny.
• C: Five categories, representing the five senses through which human beings perceive the external world.
• D: Six (later seven) categories, meant to comprehensively describe and classify everything that exists in the physical and metaphysical reality.

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