The value of \[\hat{i}\,\times \,(\hat{i}\times \,\vec{a})\,+\hat{j}\,\times \,(\hat{j}+\vec{a})\,+\hat{k}+(\,\hat{k}\times \hat{a})\] is

• A. \[\vec{a}\]
• B. \[\vec{a}\,\times \,\hat{k}\]
• C. \[-2\vec{a}\]
• D. \[-\,\vec{a}\]