In a sequence of numbers, a4=3, a5=5, a6=7, a7=9, and a8=11.

Which recursive rule can be used to find the nth term of the sequence, an?

a1=3; an=an−1+2
a1=−3; an=2an−1
a1=3; an=2an−1
a1=−3; an=an−1+2