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WHICH OF THE FOLLOWING RELATIONS ARE FUNCTIONS?GIVE REASON. (i){(a,b),(b,c),(c,d)} (ii){(-1,1),(0,2),(1,3),(-1,4)} (iii){(a,1),(b,1),(c,1),(d,1)} (iv){(x,a),(y,a),(z,a),(x,b)}
(i) and (iii) are functions because each x value, each element in the domain, has one and only only one y value, or one and only number
in the range.


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