Exercise 3.5 Consider the instance of the Students relation shown in Figure 3.1. Give an e...

Exercise 3.5 Consider the instance of the Students relation shown in Figure 3.1.

1. Give an example of an attribute (or set of attributes) that you can deduce is not a candidate key, based on this instance being legal.
2. Is there any example of an attribute (or set of attributes) that you can deduce is a candidate key, based on this instance being legal?