An object is moving on a circular path of radius π meters at a constant speed of 4.0 m/s. The time required for one revolution is

• A. \(\frac{2}{{{\pi ^2}}}\;sec\)
• B. \(\frac{{{\pi ^2}}}{2}sec\)
• C. \(\frac{{{\pi}}}{2}sec\)
• D. \(\frac{{{\pi ^2}}}{4}sec\)