A travelling harmonic wave is represented by the equation y(x, t) = 10-3 sin (50t + 2x), where ‘x’ and ‘y’ are in metre and ‘t’ is in second. Which of the following is a correct statement about the wave?

• A. The wave is propagating along the negative X-axis with speed 25 m/s.
• B. The wave is propagating along the positive X-axis with speed 25 m/s.
• C. The wave is propagating along the positive X-axis with speed 100 m/s.
• D. The wave is propagating along the negative X-axis with speed 100 m/s.