(b) Justify the choice of an exponential distribution to model the packet inter-arrival times of a queue. You may use the tollowing result in your justilication Tt linn (1 +-) = ez [10 marks (c) An RSA encryption scheme uses a Public Key described by the pair fe,n). What property should the Private Key which is associated with this Public Key satisty? [5 marks] Hence, consider the number 119, resulting from the multiplication of the 2 prime numbers 7 and 17, and justify whether the following pairs could be used as a set of public/private keys as part of an RSA Public Key encryption system. fe,n)-(5, 119) and {d, n} = {77, 1 19)