Let ( f(x) = e²x ). Which of the following is the Maclaurin series for ( f'(x) ), the derivative of ( f )?
a. ( 2e²ˣ )
b. ( 4e²ˣ )
c. ( e²ˣ )
d. ( 2e²ˣ + 4e²ˣ + 8e²ˣ + ⋅ )