What are the first five terms of the sequence defined by the given function?
f(1)=-6
f(n)=f(n-1)+2, for n=2,3,4

A. -6, -8, -10, -12, -14
B. 2, 8, 14, 20, 26
C. 2, -4, -10, -16, -22
D. -6, -4, -2, 0, 2