Is the relation a function?

why or why not?

(-8,-,,,6)

a. yes; only one range value exists for each domain value

b. no; the relation passes the vertical-line test.

c. yes; two range values exist for domain value -2.

d. no; two rang values exist for domain value -2.

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?