Which one of the following is not the basic rule for boundary conditions at the surface between two different materials ?

Boundary conditions→ μ,ϵ,σ  are medium parameter

Boundary conditions are given as

1) E_1t = E_2t

The tangential components of electric field intensity are continuous (option 1 is correct)

₂₎  \((\vec {D}_2-\vec {D}_1)\cdot \frac {\vec a_n }{|\vec{a}|}=ρ_s \)  → vector form of boundary condition

D_2n-D_1n=ρ_s → scalar form of boundary condition

The normal components of electric flux density are discontinuous by an amount of surface charge density of boundary (ρ_s) (option 2 is correct)

3)\( H_{1t}-H_{2t}=\frac{\vec {a}_n\times {\vec k}}{|a|}\) 

The tangential component of magnetic field intensity are discontinuous by an amount of surface current density(\(\vec {k}\)) (option 3 is correct)

4) B_1n=B_2n 

the normal components of magnetic flux density are continuous.