15．公司內若被查獲非法拷貝使用盜版軟體，刑事處罰對象為 (A)實際上從事拷貝行為的人 (B)公司的代表人 (C)公司的代理人 (D)以上皆是

4. In a perfect dielectric medium with the permeability of \(\mu\), there exists an electric field given as \(\mathbf{E} = E0cos(ωt - kz)ax, where E0 is the peak value, \(\omega\) is the frequency, k is a constant, and \(\hat{a}_x\) is the unit vector in x direction. What is the magnetic field (H) in the region?(A)(B)0(C)(D)(E)None of the above