Write a recursive definition for the sequence 8, 6, 4, 2, ...

(1 point)

a1=8; an= an-1 -2

a1=2; an= an-1+ 6

a1= 8; an= an-1 + 2

a1=2; an= an-1 + 8

a1 = 8; an = an-1 - 2