The maximum number of superkeys for the relation schema

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The maximum number of superkeys for the relation schema R(E, F, G, H) with E as the key is _____.

1. 64
2. 36
3. 8
4. 24

Correct Option: C

Maximum no. of super keys = 2^{n – 1} = 2^{4 – 1} = 2³ = 8