Find the equation of the circle x^2+y^2=1 in terms of x'y' coordinates, assuming that the xy coordinate system results from a scaling of 3 units in the x' direction and 4 units in the y' direction.

• A. 3(x')^2 + 4(y')^2 = 1
• B. (x'/3)^2 + (y'/4)^2 = 1
• C. (3x')^2 + (4y')^2 = 1
• D. 1/3(x')^2 + 1/4(y')^2 = 1