The electric field vector of a wave is given as\(\mathop E\limits^ \to \, = \,{E_0}{e^{j(\omega t\, + \,3x\, - \,4y)}}\, \cdot \,\frac{{8\mathop {{a_x}}\limits^ \to + \,6\mathop {{a_y}}\limits^ \to \, + \,5\mathop {{a_z}}\limits^ \to }}{{\sqrt {125} }}\,V/m\)Its frequency is 10 GHz. The phase velocity in Y-direction will be

• A. 2 × 1010 m/s
• B. 1.5 × 1010 m/s
• C. 1.85 × 1010 m/s
• D. 1.25 × 1010 m/s