Identify the domain and range for the given relation. Indicate whether the relation is a function or not and explain.


D: {1, 2, 3, 4}
R: {1, 9, 16}
no; 1 and 4 are elements of the domain and range

D: {1, 4, 9}
R: {1, 2, 3}
no; 1 is an element of the domain and range.

D: {1, 4, 9, 16}
R: {1, 2, 3, 4}
yes; each domain value is paired with exactly one range value

D: {1, 2, 3, 4}
R: {1, 4, 9, 16}
yes; each domain value is paired with exactly one range value