1. (10 points) Consider the instance of the Student relation in Table 1. Table 1: A database instance of the Student relation sid C123456Johin C234561 Karen C345612 MaryAnderson anderx10Qmath.abc.edu203.5 C456123 Helen Henderson hendex05Qece.abc.edu18 2.9 C561234 John C612345Aidan age GPA naneIname Smith Johns login smithx02aece.abc.edu 193.3 johnsx05Qcs.abc.edu 18 3.0 Smith Cocke smithx99acs.abc.edu cockex35@ece.abc.edu 183.3 193.8 (a) Give an example of an attribute (or set of attributes) that you can deduce is not a candidate key, based on this database instance being legal (b) Is there any example of an attribute (or set of attributes) that you can deduce is a candidate key, based on this database instance being legal