PLEASE HELP! URGENT! WILL GIVE BRAINLIEST Given an arithmetic sequence in the table below, create the explicit formula and list any restrictions to the domain.

n an
1 9
2 3
3 −3

A. an = 9 − 3(n − 1) where n ≤ 9
B. an = 9 − 3(n − 1) where n ≥ 1
C. an = 9 − 6(n − 1) where n ≤ 9
D. an = 9 − 6(n − 1) where n ≥ 1