Consider the below RFID protocol, where denotes exclusive or, and k is a shared secret between reader R and tag T. not recover &ecret Key K Yes. ON k R nonce nr 4 nr, R r-alive T nt R, h(nr Rek) k T nonce nt untrac 3. Does this protocol satisfy untraceability of the tag (claim untrac by T)? If so, explain why. If not, give an attack on the claim. 4. Does this protocol satisfy recent aliveness of the tag (claim r-alive T by R)? If so, explain why. If not, give an attack on the claim. Note: Your answer does not need to take the "correct roles" aspect into account.