The sequence {7,9,11,13,15,…} can be represented by the recursive formula an=an−1+2 and the function f(n)=2n+5, for a particular domain. What is the domain of the function representing the sequence?
A D:n is any whole number
B D:n is any natural number
C D:n is any natural number greater than or equal to 7
D D:n is any real number greater than or equal to 2