Consider the class as partially defined here:
 
//class PizzaOrder ------------------------------------
class PizzaOrder
{
   // static public members
   public static final int MAX_TOPPINGS = 20;
   
   // instance members
   private String toppings[];
   private int numToppings;
 
   // constructor
   public PizzaOrder()
   {
      numToppings = 0;
      toppings = new String[MAX_TOPPINGS];
   }
 
   // accessor tells # toppings on pizza, i.e., #toppings in array
   public int getNumToppings() { return numToppings; } 
 
   // etc.
}
We want to write an instance method, addTopping() that will take a String parameter, topping, and add it to the toppings[] array at the next available location as determined by the int member numToppings.    Assume any String passed in is valid and no other method modifies the toppings[] array or numToppings.
 
 The client would call it like so:
 
   somePizzaOrder.addTopping( "onions" );
Which is a correct definition for addTopping() based on what you see, above?
 
    A.  
   public void addTopping( String topping )
   {
      toppings[numToppings++] = topping;
   }
    B.  
   public boolean addTopping( String topping )
   {
     if ( numToppings > MAX_TOPPINGS )
        return false;
     toppings[numToppings++] = topping;
     return true;
   }
    C.  
   public void addTopping( String topping )
   {
      toppings[numToppings] = topping;
   }
    D.  
   public boolean addTopping( String topping )
   {
     if ( numToppings >= MAX_TOPPINGS )
        return false;
     toppings[numToppings++] = topping;
     return true;
   }
    E.  
   public boolean addTopping( String topping )
   {
     if ( numToppings >= MAX_TOPPINGS || numToppings < 0 )
        return false;
     toppings[numToppings++] = topping;
     return true;
   }
    F.  
   public boolean addTopping( String topping )
   {
     numTopping++;
     if ( numToppings >= MAX_TOPPINGS )
        return false;
     toppings[numToppings] = topping;
     return true;
   }