Answer true/false with justification. Thanks

5. Short Questions (10 marks) For each of the statements below, say whether it is True or False. For each false statement, use at most two sentences to explain why it is false. (5x2=10 marks) (a) For AES128, AES192 and AES256 the block size is 128, 192 and 256 bits respectively. (b) One of the security properties of a hash is that it is theoretically impossible to find any x and y so that h(y)=h(x). (c) Diffie-Hellman is only used for exchanging a key between Alice and Bob. (d) Symmetric cryptography can be used to provide confidentiality, integrity and non- repudiation. (e) Given a hash h of output length 100 bits. The average effort needed to find any x and y so that h(y)=h(x) is 250