A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the center of the sphere respectively are:

• A. \[0\text{ and }\frac{Q}{4\pi \varepsilon {{  }_{0}}{{R}^{2}}}\]          
• B. \[\frac{Q}{4\pi \varepsilon {{  }_{0}}R}\text{ and 0}\]
• C. \[\frac{Q}{4\pi \varepsilon {{  }_{0}}R}\text{ and }\frac{Q}{4\pi \varepsilon {{  }_{0}}{{R}^{2}}}\text{ }\]
• D. Both are 0