If $\overrightarrow{\mathrm{a}}=2 \hat{\mathrm{i}}-\hat{\mathrm{j}}-2 \hat{\mathrm{k}}$ and $\overrightarrow{\mathrm{b}}=6 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}-3 \hat{\mathrm{k}}$ are two vectors such that $\vec{a} \cdot \vec{b}$ is minimum, then $t=$

• A

  $8$
• Correct answer
  B

  $-\frac{1}{4}$
• C

  $-\frac{1}{8}$
• D

  $4$

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