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When importing a custom dataset, what is the most reliable identifier to use?

I am planning on downloading my own data set and have the ability to use any of the following security identifier types:

'CUSIP', 'ISIN', 'SEDOL', 'RIC'

Which is the the most reliable to use? My understanding is the Quantopian will convert these to SIDs upon my upload. Is that correct? If you could expand in more detail on the upload process that would be very much appreciated.

Thank you