Indicate the polarization of the following plane waves as either linear polarization, right-hand circular polarization, left-hand circular polarization, right-hand elliptical polarization, or left-hand elliptical polarization. (a) ( x jy)ejz (b) x40cos 3 108 ( t y) z30cos 3 108 ( t y) (c) zE0 cos 3 108 ( t x) yE0 cos 3 108 ( t x / 2) (d) 20.0( x jz)e j(0.2 )y