Which statement defines a function correctly

A function gives for each element of the domain only one element of the range.

Step-by-step explanation:

We have to choose from the statements in the options that define a function correctly.

From my point of view the statement that a function gives for each element of the domain only one element of the range,  defines a function properly.

Geometrically it represents that if we draw a vertical line in the graph of the function that intersects the graph at more than one points then this is not a function, this is only a relation. (Answer)

its 4 because 2 times 2 is 4, if you double the number two you get four

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)