Determine Whether the Graph Is That of a Function

Determine whether the graph is that of a function. If it is, use the graph to find its domain and range, the intercepts, if any, and any symmetry with respect to the x-axis, the y-axis, or the origin.
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A) function
domain: all real numbers
Range: {y|y > 0}
Intercept: (1, 0)
Symmetry: none

B) function
domain: {x|x > 0}
range: all real numbers
intercept: (0, 1)
symmetry: origin

C) function
domain: {x|x > 0}
Range: all real numbers
Intercept: (1, 0)
Symmetry: none

D) not a function