26. in a wave guide with conducting walls, let e and b, be the components of the electric and magnetic fields parallel to the inner walls while e and b be the c

26. In a wave guide with conducting walls, let E and B, be the components of the electric and magnetic fields parallel to the inner walls while E and B be the components normal to the inner walls. Then the correct boundary conditions are (A) E, and B, are both zero (B) E = 0 and B = 0 (C) E- 0 and B = 0 (D) E=0 and B = 0