The correct option is (A) and (C).
Graph is a mathematical representation of a network and it describes the relationship between lines and points.
Each element of the "domain" set is assigned only one element of the "range" set. Thus, there is only one output value y assigned to input x.
Equation x = 3 is not a function, as for getting input 3 there too many output correspond to input x=3
Like,
(3, 2), (3, 5) (3, 9) (3,10000)
Hence, This graph is not a function because the value x = 3 is assigned to more than one y-value and the equation for this line is x=3.
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