The child care subsidy program, in the form of a reduced child care cost rate, shall be in effect from the time the agency makes a decision for a particular Federal employee and the child is enrolled in the program until one of the following occurs:
    
    
        
        (a) 
         The child is no longer enrolled in the program;
     
    
        
        (b) 
         The employee no longer qualifies as a “lower income employee'; or
     
    
        
        (c) 
         The agency no longer has a child care subsidy program.