Turiya means as

Answer: Option B

In Vedic philosophy, particularly within the Advaita Vedanta school, consciousness is described as having four states:
* Waking state (Jagrat): This is our normal state when we are aware of the external world.
* Dreaming state (Swapna): This is when we experience dreams.
* Deep sleep state (Sushupti): This is a state of unconsciousness without dreams.
* Turiya: This is the transcendental state of pure consciousness. It's beyond the other three states and represents the immortal self (Atman), which is one with Brahman (the ultimate reality).
Therefore, Turiya doesn't refer to deep sleep, a natural stage, or a rational stage, but to the ultimate, immortal self.