The equation $\overrightarrow{\mathrm{\phi }\mathrm{\hspace{0.17em}}}(\mathrm{x},\mathrm{\hspace{0.17em}}\mathrm{t})=\overrightarrow{\mathrm{j}\mathrm{\hspace{0.17em}}}\sin \mathrm{\hspace{0.17em}}\left(\frac{2\mathrm{\pi }}{\mathrm{\lambda }}\mathrm{v}\mathrm{\hspace{0.17em}}\mathrm{t}\right)\cos \mathrm{\hspace{0.17em}}\left(\frac{2\mathrm{\pi }}{\mathrm{\lambda }}\mathrm{x}\right)$ represents

• A

  Transverse progressive wave

• B

  Longitudinal progressive wave 

• C

  Longitudinal stationary wave

• D

  Transverse stationary wave