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which relation has a domain with two elements only a. {(3,0), (6,1), (6,2), (3,3)}
b. {(1,5), (2,6), (3,7), (4,8)}
c. {(2,a), (4,a), (6,a), (8,a)}
d. {(b,3), ( b,4), (b,5), (b,6)}​