Which equation and statement below correctly explains why the table is a function? PLS HELP I MARK BRAINLEST D:

: y = 2x + 1y = 2 x + 1; for each input there is exactly one output

: y = 2x + 1y = 2 x + 1; one input value has more than one output

: y = \frac{5}{2} xy = 5 2 x; all input values are different
: y = \frac{5}{2} xy = 5 2 x; for each input there is exactly one output