1. Assess the following statements by: indicating whether it is true or false, and providing a short explanation of your answer. a. In cleaning data, substituting blanks (spaces) for missing values would have exactly the same effect on subsequent analytics as substituting zeroes for the missing values. b. A reservation ID that is only assigned once is a good primary key for a relational database table that stores flight reservations for frequent flyer business travelers. c. In asymmetric-key encryption, the public key of an entity can be used to either encrypt messages to the owner of the key, or decrypt messages from the owner of the key. d. The digital signature of the same document sent by different senders will always be the same. e. As the name suggests, the COSO ERM framework can only be used at an organizational level; divisions and units should apply other risk management frameworks.