If f(x)=∑n=0∞anxnf(x) = \sum_{n=0}^{\infty} a_n x^nf(x)=∑n=0∞anxn has R=2R=2R=2, what is the radius of f(2x)f(2x)f(2x)?
R=1R=1R=1
R=2R=2R=2
R=4R=4R=4
R=1/2R=1/2R=1/2