In these questions, the letters are linked in some way. Identify the relation and complete the last box. \[\text{Z2Z}\,\,\,\text{:}\,\,\,\,\text{Z2Z}\] \[\text{B8S}\,\,\,\text{:}\,\,\,\,\text{S8B}\] \[\text{L7}\,\,\,\text{:}\,\,\,\,\text{?}\]

• A.  L7L                        
• B.         7L          
• C.  L2L                        
• D.         L7