Which of the following describes the rule for the sequence: 2, 4, 6, 8...?
f(n)=2nf(n) = 2nf(n)=2n
f(n)=n+2f(n) = n + 2f(n)=n+2
f(n)=2nf(n) = 2^nf(n)=2n
f(n)=2f(n) = 2f(n)=2