What will be the projection of vector $\overrightarrow{A}=\hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}}$ on vector $\overrightarrow{B}=\hat{\mathrm{i}}+\hat{\mathrm{j}} ?$

• A

  $\sqrt{2}(\hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}})$
• B

  $2\left(\hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}}\right)$
• C

  $\sqrt{2}(\hat{\mathrm{i}}+\hat{\mathrm{j}})$
• Correct answer
  D

  $(\hat{\mathrm{i}}+\hat{\mathrm{j}})$

Hence, the correct answer is option: 'D'.