The electric field of a uniform plane electromagnetic wve in free space, along the positive direction, is given by E = 10(ay + jaz)e-j25x. The frequency and polarization of the wave, respectively are

• A. 1.2 GHz, left circular
• B. 4 GHz, left circular
• C. 1.2 GHz, right circular
• D. 4 GHz, right circular