Please solve whatever you know but fast please

Question 1: Determine whether the following sentences is True or False-- [14 marks] 1. In direct digital signatures, signing can be done only on the hash of the message. 2. The CTR mode does not require an Initialization Vector. 3. Can a user of RSA choose the encryption exponent e = 4? 4. The main difference in MACs and digital signatures is that, in digital signatures the hash value of the message is encrypted with a user's public key. 5. If we use exponentiation to encrypt/decrypt, the adversary can use logarithm to attack and this method is very efficient. 6. In the group G=, when the order of an element is the same as order of the group (i.e. f(n)), that element is called a primitive root of the group. 7. Confidentiality can only be provided if we perform message encryption before the MAC generation