Teaching Rajasthan Basic Computer Instructor 2021 Mock Test DBMS Query Language Relational Model

Let x, y, z, a, b, c be the attributes of an entity set E. If {x}, {x, y}, {a, b}, {a, b, c}, {x, y, z} are superkeys then which of the following are the candidate keys ?

1
{x, y} and {a, b} 
2
{x} and {a, b}
3
{x, y, z} and {a, b, c}
4
{z} and {c}
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