The value of the expression \(\frac{1}{4}\left\{ {{{\left( {a\; + \;\frac{1}{a}} \right)}^2} - \;{{\left( {a - \frac{1}{a}} \right)}^2}} \right\}\) is:

• A. 1
• B. 4
• C. 1/4
• D. 1/2