For wave propagation on grounded dielectric sheet, the equation to be satisfied by Ez , in the region of presence of dielectric 0≤x≤d for the propagation to be in Z direction

• A. (∂2/∂x2 + ∈rk02– β2) eZ(x,y)=0
• B. (∂2/∂x2 + k02– β2) eZ(x,y)=0
• C. (∂2/∂x2 – k02+β2) eZ(x,y)=0
• D. (∂2/∂x2 + ∈rk02) eZ(x,y)=0