All persons entering in or on Federal property are prohibited from loitering, exhibiting disorderly conduct or exhibiting other conduct on property that—
    
    
        
        (a) 
         Creates loud or unusual noise or a nuisance;
     
    
        
        (b) 
         Unreasonably obstructs the usual use of entrances, foyers, lobbies, corridors, offices, elevators, stairways, or parking lots;
     
    
        
        (c) 
         Otherwise impedes or disrupts the performance of official duties by Government employees; or
     
    
        
        (d) 
         Prevents the general public from obtaining the administrative services provided on the property in a timely manner.