20. An electromagnetic wave has a magnetic field given by (x,t) = {1.0 x 10'10T) sin((1.0 x 104rad/m)z + (2.3 x 1012rad/s)t) 5'1 In the above expression, T, rad/m, and rad/s are included to label the units (T is Tesla, rad/m is radians per meter, and rad/s is radians per second). Which of the following is the propagation direction, the electric field polarization axis, and the wave speed? Propagation direction E polarization wave speed (m/s) A. +z' y 2.3 X 108 B. 2 x 2.3 x 108 C 2 y 1.7x 108 ; Q. +37 2 3.0 x 108 E" y z 1.7x 108