The area of a square is\[({{x}^{2}}+8x+16)c{{m}^{2}}\]. Find the length of its side.

• A.  \[(x-8)\,cm\]                                    
• B.  \[(x-4)\,cm\]    
• C.         \[(x+4)\,cm\]                   
• D.         \[(x+2)\,cm\]