What is true about the 'Lost Saraswati River' of the Vedic period?

It flowed only through present-day Gujarat and emptied into the Bay of Bengal.

It was the smallest river mentioned in the Vedic texts and had no connection to the Himalayas.

It disappeared around 5000 BP due to climatic and tectonic changes, but is believed to still flow underground beneath the Thar Desert.

It originated from the Vindhya Range and merged with the Ganges near Varanasi.

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