1b.1—Definitions.
         For purposes of this part—
    
    
    
        
        (b) 
        
            Preliminary Investigation means an inquiry conducted by the Commission or its staff, other than a formal investigation.
    
    
        
        (c) 
         Investigating officer means the individual(s) designated by the Commission in an Order of Investigation as Officer(s) of the Commission.
    
    
        
        (d) 
        
            Enforcement Hotline is a forum in which to address quickly and informally any matter within the Commission's jurisdiction concerning natural gas pipelines, oil pipelines, electric utilities and hydroelectric projects.