If \[{{\mu }_{\kappa }}\]is coefficient of kinetic friction and \[{{\mu }_{s}}\] is coefficient of static friction, then

• A.  \[{{\mu }_{\kappa }}<{{\mu }_{s}}\]                                        
• B.  \[{{\mu }_{s}}<{{\mu }_{\kappa }}\]
• C.  \[{{\mu }_{\kappa }}={{\mu }_{s}}\]                      
• D.         \[{{\mu }_{s}}\le {{\mu }_{\kappa }}\]