Which of the following is the exponential form of factors of \[{{a}^{2}}+4a+4\]?

• A.  \[{{(a+2)}^{2}}\]                             
• B.  \[{{(a+1)}^{2}}\]             
• C.         \[{{(a-2)}^{2}}\]              
• D.         \[{{(a-1)}^{2}}\]