A proton moving with a constant velocity passes through a region of space without any change in its velocity. If \[\overrightarrow{E}\] and \[\overrightarrow{B}\] represent the electric and magnetic fields respectively, then this region of space may have [IIT-JEE 1985; AMU 1995; AFMC 2001; Roorkee 2000; AMU (Med.) 2000]

• A.            \[E=0,\,B=0\]                       
• B.            \[E=0,\,B\ne 0\]
• C.            \[E\ne 0,\,B=0\]                 
• D.            \[E\ne 0,\,B\ne 0\]