Richard ha a computer crash and los most of his personal data, inluding thr private keys to hos crypto holdings, what steps can Richad take to regain access?A) The keys will reset after 72 hours, so he will be able to access his holdings at thst point. B) Unless Richard had thr information backed up his crypto will be inaccessible for him or anyone else C) He can contact th coin exchange he used and the will be able to restore hisaccess and reset the keys. D) Blockchains are a public ledger so there are no private key involved.